My 64 drivers side bushing/gear that connects to the handle is shot. I am toying with swapping this part from an old regulator, but i was thinking since i will have the door apart, i might replace the complete unit. I have a decent one on a parts truck. Does anybody have any experience with aftermarket units? Its a weekend driver, the original has lasted 56 years, i am 55, if i fix it right should never have to work on it again.