Thanks guys, for your efforts.
I have done some more checking, and the seals for '83 to '88 CR250 are all the same. The seal and wiper kit I have is from White Brothers, bought from a local dealer. He says they will work, but I am not positive about it. Here are the numbers on the package:
79466 29-218
(0207A) 51490-ML3305
FORK SEAL KIT, 43MM
I do already know that this White Brothers 29-218 seal kit is for a '92-'94 and what I need is a 29-217 seal kit (for '83 to '88), but when I asked the dealer about it he said he crosschecked it and the 29-218 would work - I am not sure he is right.
The reason I was asking about the Parts Unlimited catalog # is that I am pretty sure that this was the catalog he was looking at when he was doing his "crosschecking". To tell the whole story, one of the seal kits was ruined before I ever took it out of the package (long story) so I can't take it back anyway, but would like to know if the other set will work or just buy 2 new sets.