Fork Seals 74 DT 125

Am attempting to replace my fork seals 1974 dt 125A-- and ordered from Dennis Kirk--Parts Unlimited brand. I removed the old ones--only they were kind of baked in--and came out in tiny bits and peices--so nothing to compare new ones to. The ones I have aren't going in. The manual says tap then in and seat them with a big socket--but these babies aren't gonna go---Unless there is something I don't know about installing them. Are the Parts Unlimited ones bogus? Yamaha wants $29.00 Apeice--and as much as I like the ole DT--I don't like it that much. I just hoped to get cheaper fork seals or some advice on how to install them. It's a really tight fit, right? Anywhere besides Yamaha or Dennis Kirk to get the seals. I've looked on Ebay but nothing I can find. Just want to get this front end back together now--so any help is Really Appreciated. THANKS!