Your best bet is to try these approaches:
* Online parts retailers: Search on sites like RockAuto, AutoZone, Advance Auto Parts, and eBay using search terms like "1989 Dodge D100 wiper transmission bushing," "wiper motor linkage bushing," or even "wiper arm bushing." You might need to get creative with your search terms. Be prepared for the possibility that you won't find an exact match.
* Junkyards: Check local junkyards or salvage yards that specialize in older vehicles. This is often the most cost-effective option, though finding a truck in good enough condition to salvage the bushing might require some searching.
* Dorman or equivalent parts: Dorman makes a wide range of repair parts, including many that aren't directly sold by OEMs anymore. Look for their website or their listings on the online retailers mentioned above. They may have a generic bushing that fits, but you'll need to carefully compare dimensions.
* Local Auto Parts Store: While less likely to succeed than online searches, a knowledgeable counter person at a local auto parts store *might* be able to cross-reference the part or suggest a suitable replacement.
Important Considerations:
* Measurement: If you can carefully remove the old bushing, measure its dimensions (inner diameter, outer diameter, and length). This will significantly improve your chances of finding a suitable replacement.
* Replacement strategy: Instead of just the bushing, you might find it easier to replace the entire wiper transmission arm if it's readily available. This would eliminate the hassle of replacing just the bushing.
* Generic bushings: Be prepared to find a generic rubber bushing that will need some modification to fit.
Finding this specific part will take some detective work. Start with the online parts retailers and be prepared to use your measurements and some creative searching to achieve success.
