My 65 C50 has two wheel cyl.one upper and one lower had to replace them all. My new lines fit alright even the jumper. My problem was the bleeder wouldn.t thread in. An old timer just pryed the brass flare out of the cyl. and it worked (threaded) perfectly Thirty seconds and he had it fixed. It sounds like your problem no brake thread size would fit. Three hours of cussing and skinned knuckles. Just an educated opinion. ??????
