http://www.bikebandit.com/bel-ray-hvi-racing-suspension-fluidLots of folks make shock fluid. I dont know what wt Murph sells right off.
I do know this, when you commence draining your Conc shock oil out thru the air vent hole, prop it up on an angle so it can drain, and then leave it for a day or two. It takes a long time to empty out.
I've seen some nasty looking stuff come out of shocks, same thing when i drained my old Conc shock== nasty looking.
The kit Murph sells is handy, and it works fine in my humble opinion.
Dang, just cant recall at this moment what wt oil it is.
Good luck to ye.