Don't limit your self to the dealer when looking for parts. I know some times the dealer is the only way to get your parts, but some of the time the dealer is just a reseller. When I was looking for a water pump and pulley for my 853 I went to the dealer first for the tune of $342 .00 plus tax and shipping.(wow). No way I'm paying that, so I started looking elsewhere. I tried the auto parts stores with no luck, I tried E bay with no luck( allthough other models where available for $77.00). That Isuzu 4jb1pk-03 motor, I guess it's not that common. Ended up looking for Isuzu industrial motors on the web and found a bunch of people selling the parts I needed. They where able to call Isuzu with the base model # (4jb1) and the ser.#. They got me the Isuzu part # and told me when the motor was made. I ordered the parts for $ 211.00 plus shipping and no tax, a savings of $131.00 not including tax. Still waiting for the parts to show up, I'll see what happens when they get here.