questions about putting s14 dif into s13

[240driftguy]

I have a welded s14 diff I'm trying to put into my s13 but I measured them both side by side and the s14 is a little shorter? can I use my s13 ds? and does anyone know what size bolts I need to install it because the s13 ones are to short. I know I need to swap diff covers. also is haveing the bushing mounts ok because the s13 is a solid mount ? its goint to be mainly for drifting