Here are common conversion parts I sell on a regular basis:

Pair, billet housing ends $70(plain)- $150(deluxe)
Pair, 35 spline axle package $300 assembled
Bearing/seal/shim kit $115
Forged steel 1350 pinion yoke $70 with U-bolts
35 spline power-lock internal parts kit with clutch pack $200
Complete, 35 spline Track-Lock sure-grip $350
Ring and pinion (most ratios) $195
Pair, spring perches $15

You can buy 3 1/8" U-bolts from Napa. These have a tight radius that fit the truck housing AND original shock plates.