I recently did this using the Sue Miller supplied headlining - the earlier posts are correct in that you need to identify the number of headlining rods in your particular car. It's not too difficult but takes time to do and you will need to remove the front and rear windscreens, the door seals and the interior rear 3/4 panels.
If I recall correctly you will probably need:
- The headlining and the same fabric for the top part of the 3/4 panels (this is assuming your interior isn't oatmeal - in this case I think the panels were originally covered in a black leatherette(?) material) - I got mine from Sue Miller
- Some foam padding material (I think the stuff I got was in sheet form about 1cm thick) for padding the fuel tank breather pipes, the 3/4 panels, above the front windscreen and the a posts - I got mine from Woolies
- special glue (apparently you need one that is designed to withstand higher temperatures that the the usual evo-stick type) again I sourced mine from Woolies (and no I'm not affiliated with them!

) you'll also something to spread the glue.
- a pop riveter and rivets (the bottom part of the upper cover on the 3/4 panels is held on with glue and an aluminium strip pop riveted to the fibreglass panel)
- lots of spring clapms/bulldog clips
- some rust-stop and paint...
Given that you're in the USA I'd guess R Dent is the place to try for the Lotus only bits, hopefully you'll be able to source the foam etc locally.
You'll need to carefully remove the windscreens, door rubbers, 3/4 panels, and any trim that attaches through the headlining (e.g. sun visors, rear view mirror, interior lights etc). As you go, take photos/notes so to help with the re-trimming. It's also worth making some templates up to show you where the holes will need to be made in the headlining for these trim items once it's fitted.
I re-trimmed the upper parts of the 3/4 panels first as a practice before doing the headlining. Take your time and stop and think before each step! If I recall correctly you'll need to do the following:
- unstick the old covering fabric from the top of the panel and drill out the alloy strip holding the bottom part on.
- thoroughly clean the fibreglass and the alloy strips to get rid of the old foam (this assumes that the 30+ year old foam has now turned to dust), I carefully used a rag with some cellulose thinners to scrub it clean. You may need to repair the fibreglass in places if it's cracked/broken.
- Cut the lining fabric to approximate shape allowing for overlaps etc.
- When fitting the bottom edge of the fabric to the fibreglass panel, put the outwards facing part of the material facing towards the panel, you then glue and pop rivet the alloy strip in place fixing the bottom part of the fabric to the panel. When you've put the padding on you will then fold the material back on itself over the alloy strip and padding
- You then glue the new foam padding onto the panel covering the alloy strup - don't use too much glue but do make sure the foam sticks properly (esp where the coat hook goes).
- glue the edges of the panel and the covering material, again don't use too much glue or it will come through the holes in the lining material, then fold the fabric back over itself where its glued/rivetted in place and pull it tight over the foam so that there are no wrinkles clamping it in place so that it sticks whilst remaining tight. You will need to trim the cloth, mitre it at the corners etc and it's probably best to do a dry run before gluing. Once you've put the glue on you give it some time to set and then it will "grab" the material quite well (the down side of this is once it is stuck it is stuck!).
- allow to dry and carefully make the hole through the foam and cover for the coat hook.
I hope the above is a help - very difficult to describe, much easier to explain and to see what I mean when looking at the actual thing. Do feel free to PM me if you need more help. There's a brief write up of fitting the headlining plus some phoots here:
elan-plus-f13/1972-front-screen-fitting-parts-question-t19480.htmlIt's quite a daunting task, given that it's very visible once done BUT take your time and do it right and it's a very satisfying job.
Craig