18x9.5 +12

I did the same pushing/holding the top of the lip out. But I just used washers.

you might consider a countersunk Allen bolt for attaching to lip so the tire won’t catch it.

I didn’t have access to a fender roller like that. It was about 10 years ago. So I used the baseball bat technique
View attachment 1715687268
I plan on getting some different bolts, this is just stuff I had laying around for testing purposes.