With Morrison ILF limbs can you use other Morrison risers with them or do you use only an ILF Morrison riser?

ILF limbs will only fit ILF risers.
But, anybody's ILF risers, and visa/versa.

There is a lot of info on ILF setups at Pete Ward's site

 Pete Ward\\'s web page  

Look under "Projects", then "ILF Guide"  

ILF stands for International Limb Fitting,like said they have to be used on an ILF riser whether it is a Morrison ILF or any other ILF riser.And you can use other ILF limbs on a Morrison ILF riser.