Those brackets were fitted to both LHD and RHD late plus 2's with alternators - I have always thought they were identical in mounting height - but if they have different part numbers then I must have been wrong
or maybe some other difference for the different part numbers. its strange to make 2 versions when the LHD version would suit both LHD and RHD cars
I would love to see the differences in dimensions - I have a RHD one and will measure it up
Just as a side note these are especially valuable for a high reving race twin cams if you use an alternator as they dont break with all the engine vibration you get above 8000 rpm around the front of the engine. I am just replacing the alternator top adjusting arm today on the elan as they fatigue and fail after about 2 years of racing. I am on version 5 now and each one has been stronger than the last - maybe this one will not fail.
Not easy to find them and a good candidate for someone to CNC machine a batch for sale in both LHD and RHD versions maybe
The one that came with my Plus 2 now resides on my Elan and an new one for the plus 2 plus a spare would be nice
cheers
Rohan