looking for a rubber filler neck grommet that goes onto tank i have tried ebay, napa, autozone, oreillys, penny pincher, parts authority, summit racing, dodge dealership or if someone has the inner hole dimensions and outer dimensions that would be great or part number. need asap

I know this is an old post, but somebody may use this answer in the future.

Mopar 5217578
Dorman 577-500

I found this information on Rock Auto’s website.