License plate rubber bumper issue

Looking for a little help. I am nearing the completion of restoring my 1963 dart 170 2 door post car and ran into a little issue. I ordered the replacement rubber bumper kit from DMT and the bumpers that I'm assuming are meant for the rear license plate are too small. They are for a 1/4" hole. The hole for the rubber bumper on my car is between 1/3" and 3/8" (closer to 1/3). Unfortunately I no longer have the original bumpers as they were dry and rotted before removal.

Does any one have a source for these? Has anyone else ran into this issue? I also ran into an issue with the license plate mounting clips. I bought what I though would be correct, but my car came with metal license plate clips (only one was there). Fortunately Classic industries has those.

Any help here would be appreciated.

Call DMT !

Their service is stellar.

They might be able to make it for you or use a similar substitute part to help you out.