I heard that Waggin used junkyard chevy S-10 rubber and it fit and worked, should be a bunch of em in the yards. I'm not near that point yet (already found some stuff at JC whitney for about 1.99 a foot.) so it's a toss-up which one to get. if you go JC whitney style the 3/4 fit's(my size on 66 dart) or measure the cross section of your year bulb style , it isn't stock but it does work.