Orion 300 PRQ pre-amp and 3100 SVF

Hey guys, I'm putting my system together piece by piece. I have the three HCCA g4 amplifiers, (225, 250, 275). I'll also be using my Orion 3100 SVF 3-way crossover (sun and stars).

I would like to know if I can run the 300 prq with rca's, or if it's strictly for use with din cables.

Last question: was Orion the only one to use the g4 style heat sinks? I ask because I'm looking for an old heat sink to cut up for spacers. For instance, the Memphis ST1300D used the same heat sink as the Zapco Studio 500. It would be much cheaper to find one that didn't say Orion on it.

If I need to put more info, let me know. Thank you!

 

Where is everybody? There's three of you I thought would respond to this. If these are dumb questions, I'm not going to know unless somebody says so. (Then it will be up for debate).