I have Samco hoses on my 91 164L. I bought them from Brad Anesi in NJ years ago, and I seem to recall him being responsible for getting Samco to manufacture these in the first place. I think the set of everything you needed was about $250. This included intake runner hoses (you needed to cut the 6 lengths yourself), upper and lower radiator hoses, water pump to both cylinder heads (these are really great to have) and a few other cooling systemhoses that run to and from the overflow bottle.
I do not believe these were ever made for the 24V engine. I think the intake runner diameters are different enough, as well as the upper radiator hose and rear hose (the one that comes out from between the cylinder heads on the 24V) being completely different, there's little point in trying to adapt a 12V set to the 24V. It would be nice if someone could convince Samco to make a set for the 24V. I have somewhat of an objection to the red and blue, and would prefer just a regular old black if it were an option. I may be all wrong about the non-availability of the 24V sets, just thought I'd offer what I know.
Cheers,
Karl