Birf. question

[88runner]

OK, I would like to know if the ball and cage are the same in the ifs birf. and solid axle birf.

Just want to know cause I've buyed 2 smurfields and want to have a stock birf. for spare but the one in my solid axle are in bad shape so since i'm doing SAS I'll have 2 ifs birf. in good shape.

[mr4x42u]

I don't think there the same..I think the ifs are smaller..

[88runner]

i don't know if the inside is smaller, but the outside is bigger than a solid axle birf.

I will begin to cut the ifs soon so i'll find out, just wanted to see if you guys knew if it was possible.