Vintage Air Gen IV heater fittings

[snappytravis]

Just a little confused on this one, I am working on gen IV heater hoses I see that va sells one hose that goes from 3/4 to 5/8 it seems like, I have two fittings for the heater hoses off the heater box, They are both the same thread. I have a ls3 with the stock press in nipple fittings. What is the best way to run my heater hoses, Tap the water pump? Then what should I use on the VA Gen IV for the heater hose fittings.
Thanks

[ErikLS2]

I pulled out the heater hose nipples form my LS2 water pump and easily pipe tapped them for an -AN to NPT adapter without even enlarging the holes and then cut the VA heater hose adapters and welded on an -AN fitting. I remember seeing somewhere an -AN to the VA heater core hose end all in one with the o-ring end but can't recall where, maybe the XBR catalog.