The head uses the same seat as a Male Stabilizer... The seal kit is the same as Female Stab but with two extra o-rings. The plunger is the same as the Boulder/Pebble with an extra hole. CA Cart Regulator [PPSP027] - $105.00 : Palmers Pursuit Shop, Where Custom Still Means Something
The CA version.
As you can see below, I tried to trim as much as I could off of a Stabilizer.
The Safety valve is basically a low pressure Stabilizer plunger built into a NPT fitting. 10-600+ psi... Accuracy gets a little sketchy above 600.