Installed all 4 same size tires on stock rims, problem?

Ok so i liked what Dag did with his 4 matching pitbull growler 2.5 27" so i went ahead and bought 4 of the same tires in 26"x9x12. Took my stock wheels in to a tire shop and left them there. Show up 2.5 hours later and they tell me they can’t get the bead to seat on the rear 7" wheels. I didn’t do my research and thought all the rims were the same width. The rears are 7" and fronts are 6". They got the fronts on, but not the rears. They told me i’d need to buy bigger rear tires or get new wheels. I was pretty stressed because i’m heading hunting in a few weeks. So i look on pitbull’s site and it says to use a 7" rim for the 9" wide tires. I talk to them on the phone and they say try another tire shop. I go to another tire shop this morning and they have a hard time as well, but they get them on. So i’ve got 4 26x9x12 pitbull growler, however they look slightly different due to the 1" wider rims compared to the front. It shouldn’t affect the overall diameter that much i’m thinking. It looks ok. I’m going for a test ride to test the tires and my shim and purple spring right now. I didn’t anticipate buying new wheels, so i’m hoping everything will be ok. What do you guys think ?