I've seen those and they are pricey. At least around $40 each.

Got the new rail installed. I have to make a rail hold down, which shouldn't be too challenging. Still waiting on some aluminum plating to block off the thermostat housing. It's going to be a tight fit.. I may remote the fuel pressure regulator after all.

I probably won't do much work on the engine tomorrow. I am going to swap the differential carrier and gears tomorrow. I'll probably have to go to a shop downtown to have the pinion bearing pressed off, and I'll hone the old bearing out a bit and use it to set the number of shims for a good tooth pattern then install the new bearings on the pinion.
Rebuilding an OHC Pontiac 250 with EFI and a Turbo