Try NKG TR5 (2238). I found it on the NKG website
i found it on ngk #2238
NGK - BPR4EY AUTOLITE - 65
What is the fram oil filter cross reference for onan oil filter 1220893
1492341
Napa FIL 7398
Fram PH3614
Most cross to a Fram PH 7575
There are several places you can find a cross reference guide for Onan oil filters. Most auto parts stores will have reference guides. Many department stores like Walmart, Sears or Target will also have them.
That would be a Fram CA8235
That would be a WIX 42362
Fram CA140
Onan - P/N 167-0272 Champion - P/N RS17YX Autolite - P/N 106