Reputable 340 Rebuild Kit

My father measured the bolt pattern that are currently on. Hes getting 2 3/8"?? I know there is a 2 5/8" = 5 x 4-1/2 and 2 3/4" = 5 x 4-3/4..

If i go with the 4" KH's.. i dont think my wheels and rims will work ): gonna have to switch up front and then later switch the backs IF and WHEN i convert to an 8-3/4 rear end