Just got back from summit, I took my vintage sbc M/T valve covers down there to get a new breather and oil cap. I went through probably 10 different twist in caps and none of them fit right. My breather hole is 1 3/8" OD but that wasnt the problem, its that the lips on the groumets they had were too small so they wouldnt press and seal into the valve cover. The twist in oil caps they had were way to loose when tightened. About 4 different guys said that I should sell my valve covers and just buy new ones because its going to be a pain to find parts to fit them because they are so old. I for one didnt think it would be this much of a hassle to find a breather and oil cap. What gives? am I not looking in the right spots? I would think that these parts were as standard as it gets. I guess not.. Any suggestions?