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Most auto parts retailers can help you.
You can find replacement radio knobs for a 1998 Toyota Sienna at auto part stores. You can also find replacements by contacting the radio manufacturer.
Go to a Toyota dealer.
AutoTrader.com
1993 on Toyota corolla vacuum hose
dealer bring vin
where do you find the filling plug for the gear oil on a 1993 Toyota tercel
at http://www.alfaparts.net/toyotapu.htm
It is relatively easy to find a replacement engine for a 1998 Toyota Camry. Your local mechanic may be able to order a new one directly from the company or a used one at the local junk yard.
try going to a salvage yard
http://www.everdrive.com/SearchResults.aspx
Probably interior trim