Center hole is 2 3/4 inches (picture 6), ... Measuring two holes, from outside to outside of hole, across center, is 5 inches (picture 5), ... And measuring two holes next to each other is 3 3/4 inches (picture 4). Hope this helps. :) Sorry I didn't think to do this sooner.
Please look at photos. If you are interested just text me at 7854seven57three9O, or message me through here. Make me an offer. I have no idea what they came off of or what they fit. They are heavy duty for 13" aluminum wheels. Complete set of 4. Tires probably aren't any good as old as they are. Always been stored inside. We are just cleaning out the shop and Dad said they gotta go. If you know what they are please let me know. I would greatly appreciate it.