Mounting LS-56 in HRAP1 ver B. ( edition) Screw Size?

Hello all,
I’m trying to mount an LS-56-01 in a HRAP1 stick. It’s your typical ver B. HRAP. As such, I have an MS mounting plate and I’m trying to put the stick in, but I don’t have the right screws to mount it. Does anyone know what I need? Would it be cheaper to just get a VF mounting plate instead?