Fast ratio steering box

The 16:1 fast ratio boxes are getting pretty scarce these days, and therefore overpriced. Mopar made replacement worm/nut assemblies in 16:1 and 20:1, but they seem to have gone away also. I got a 20:1 from Mancini a while back, maybe they have some left.

Flaming River makes a 16:1 replacement box which is not visually correct (or even close), but it's 40 years newer than any factory part. Sadly the Flaming River box is also expensive, although cheaper than a nice factory box.