NAPA part numbers for engine oil seals

[lizrad999]

Ok, the 440IC is back on her feet (tracks) and is moving around but she seems to have sprung an oil leak. Yes, I took the lazy way out and didn't replace the front and rear seals on the engine. (not sure which is leaking if not both...)(gonna replace them both anyway.)
Also, my clutch is slipping, so what are the odds it's got oil on it.....
Anyway, I'm going to pull the engine and replace the seals and deal with the clutch. My question is, does anyone know of some NAPA part numbers for the front and rear seals? I've found them online with an entire gasket set, but all I need is the seals and I'm too cheap to get the whole set. OR, does anyone have a set of new ones they can measure with some calipers for me?
This is assuming of course that the seals are somewhat standard and not some weird item I've never seen before like the funky bellows type found in the rollers......