PLEASE HELP.... U Joint Problem !!!! Please I wanna Drive my car:)

Okay Guys so Her we Go I bought a 1967 Valiant Signet With a Fresh 360 and a 904 Trans. The car had the Wrong u joints in it and the caps were all coming off cause the Original owner was a smuck so each ujoint only had three clips in them cause the u joint was to long. So I have Baught 2 diffrent sets of you joints from napa and there all just to long and I cant get the last clip in. I have Tried Napa part 316, 315 they said they dont have anything smaller then that. I dont Know what to do were to look or what I need. I just bought this car and im dying to drive it Please if you have any info please let me know.