This is probably a mandatory fix as soon as you buy one of these cars. I'm so mad at myself that I've delayed this on my 300D. Changed my primary today and now I've got a colossal leak at the primer. Probably going to shorten the life of the right motor mount now. Vice grips work well to remove and replace by the way. Otherwise you need a crows foot.

Kevin
1978 300D
1979 240D