Converting lap-only to three-point rear seat belts?

[Oddball]

I posted this on a few forums and thought I would try here.

I have an 86 IROC with lap-only belts. In order to fit the kids in the back seat when they move to booster seats I need to have lap and shoulder belts. Do any of you know of a kit that will allow me to convert? Do you know if a 4th gen setup (assuming they have shoulder belts) will fit?

Thanks!

[foff667]

all 4th gens & some 3rd gens have shoulders in back...i know my 89 did...id assume you could get some out of an 89+ 3rd gen but and i cant seeing it being horribly difficult to install.