Wow! that's a bunch of $$ for rebuilding.
Assuming the gears and worm shaft bearings are OK (which they should be) you could DIY for a LOT LESS. Sector shaft bushings, and gaskets are available from the usual vendors and a sector shaft seal (to replace the original felt seal) is maybe $10 from RockAuto.
The Factory Service manual details the teardown, reassembly and readjustment. I did mine and it steers well.
