Love to find a simple replacement

Greetings. Take a look at the 81-140 with the 7/16" wide wheel. This is possibly your best roller to try and adapt to your door. Review the dimensions, and see what you think. 

We did have a roller like this, but it was discontinued some time ago and is no longer available. The 81-140 is, I think, your only bet, but it's different enough that I can't make any guarantees. I apologize for any inconvenience. 

We do carry the 81-203 , which has a 7/8" long axle, as well as the the 81-303 which has a 1" axle. As for the rollers, we do carry the 81-225 steel wheel and the nylon wheel 81-237, along with the 81-236. However you will have to see if these wheels are wide enough to be used with your door. I'm not familiar with your door and not sure how the 81-140 roller can be installed. I find it similar to your roller. Take a look at all the suggestion of parts on the web site to see if you can use any of these to repair your door.