I would dig through EBay! I've been able to find a few New Old Stock parts for my 91 on there. Good luck!
1991 Dodge B250 Zephyr Conversion. "Bi-frost" 74,000-ish original miles and counting.
- 318TBI; has headwork and other bolt on upgrades. Runs strong and smooth!
- Powertrax locker
- Rear air springs, ride control shocks all around. Steering stabilizer.