He needs the center cartridge not the housings.
the cartridge comes from bw in a standard size and then htt machines the center section, exhaust hsg, and comp covers for different size wheels. htt will do the same thing to the cartridge and charge you alot more than what the cartridge + machine work costs. my guy charges me $10-$15 for machine work on the center cartridge.If he got a direct replacement why would he need to have it machined out? I think that would only require machine work if he got a differant cartridge that was not a direct replacement. Maybe I am confused.
thank you, someone give me credit