Onan 5500 Cover

Right now: go to EBAY and search for "Cummins Onan RV Generator access door - used - 5500" Asking price: $110.00 + $20.00 shipping, or make offer. One available. Good condition.

P.S.: Don't run the generator under load without the access door installed. It may overheat and be damaged.

Chum lee

Read forum look for "My generator Died and I' can't afford replacement" type posts and make an offer for the part.

Or E-bay et-al or Used RV parts places

You can check out E Bay This one might work.

Cummins-Onan would be best chance.