After quite a bit of googling and reading, it appears to me that there are at least two variants of Onan 5500 generators (maybe more?), with different oil filters. So try to get model information and do some independent cross-checking before stocking up on filters based on what you read on the Internet.
For my model HGJAB, I believe that the following oil filters will all work, although the lengths are not identical:
Onan 122-0836
Wix 57398
NAPA Gold 7398
Also, you're going to want an oil filter wrench. It's not easy to get a grip on the darn thing, and standard filter wrenches aren't likely to work.
Onan part #420-0577 or
NAPA skinny 3 finger 775-9018
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