BlueOx TigerTrak is same as Henderson SuperSteer Track Bar. I bought ours from some RV online parts outfit.
The Monroe Damper replacement is around $30, various sources. More for the Bilstein replacement. Be sure what you get includes a boot to protect from stone chips, it's extra for the Monroe.
I remain skeptical that you need a steering gear, but there've been good comments here about
Red-Head Gears I replaced the gear on our old 1983 E350 at over 100,000 miles. It was loose. When I adjusted it, the Pitman (output) shaft no longer sealed and it leaked. I replaced with an AutoZone rebuilt box. It didn't leak but it was no tighter than the old one after adjustment.