I got new ones for an 90 318 pre-mag LA from advanced auto

they are the hollow ones and cost the same a stock solid ones for 83-84 LA318

one thing to look for on the heads are the larger push rod holes with the roller cams

early heads will need the hole clearanced and then will work as a roller head

I think I have a set of the solid pre-mag roller PR,I will measure them today,they will be the same as the hollow rods

the pre roller LA rods are 7.5 IIRC