I ran a double ended psc ram/orbital on my K5 last year, worked awsome, they were priced fair and there service was exellent (even to me up in Canada).
POS is what I ordered for my next build... should have stuck with psc as it took for ever to get and was still missing pieces. what ever, it's said and done now. I'm not going to start another rant on this board about that issue. Nice products though, kick ass large double ended rams and clevis ends. the clamps to hold the ram are nice and beefy as well.
regards