It's a shame no one answered this as I'm in the same boat (as it were!)
I am just about to investigate mine but, to save time, does anyone know if they are serviceable?
Also, if I need to buy a replacement, I am I right to assume they are handed? If so, can they be converted from LHD to RHD?
So many questions!
Edit: I should have said, mine in a '71 240Z