Outer Limits 4x4 Board

I know RFS GXL rims fit 79's ok. However do IFS also suit? I say this because I've noticed the RFS stick out a fair way at the front.

IFS rims don't fit. A mate tried them and they hit the rear springs.
The rigid front end ones are hard to find.

Thanks for that answer HIL01X

Also has anyone noticed that there are 2 types of RFS factory steel wheels? One appears to be a shallower offset, is it a 16x7?