However, while they are very similar, there *could* be minor variations between the 2005 and 2006 model years, perhaps due to mid-year updates or trim level differences. The inability to find replacement taillight lenses *everywhere* could be due to several reasons beyond just model year differences:
* Part Discontinuation: Toyota might have discontinued the part. Older vehicles eventually see their parts become harder to source.
* High Demand/Low Supply: If the lenses are frequently damaged (a common occurrence for taillights), the supply might be depleted faster than replacement parts can be made.
* Aftermarket Challenges: Aftermarket suppliers may not be producing them in sufficient quantities, if at all.
* Incorrect Part Number Search: You might be using the wrong part number or searching using incorrect terminology.
If you're having trouble finding them, try these strategies:
* Use precise part numbers: Find the correct part numbers from a Toyota parts website or a reputable online parts catalog (like AutoZone, Advance Auto Parts, etc.), specifying the exact year and trim level of your Sienna.
* Check salvage yards: Junkyards or salvage yards are a great place to find used parts, though condition and warranty are often not guaranteed.
* Search online marketplaces: Expand your search beyond the usual auto parts stores to include online auction sites and specialized parts marketplaces.
* Contact Toyota dealerships: They are the ultimate source for OEM parts, although they will likely be the most expensive option.
In short, the high probability is that 2005 and 2006 Sienna taillight lenses are compatible, but supply chain issues might be the main obstacle to finding replacements. Be precise with your searches using part numbers and expand your search locations.
