[stevemclark]

You are talking about the back of the speedometer, as far as I know it it not available.A re-builder may be able to fix it from an original one that has that part on it still good.You might try E-Bay to find a good part.Good luck.Most every part can be found somewhere,you have to find it.Someone here may have it for you yet.I had one rebuilt and it sticks and reads way to slow.I am looking for another one.