Tandem wheel assemblies

Attached are pics of wheel assemblies that I am having trouble matching. I could have sworn you carried them at one time but I no longer see them on you site.
The distinctive feature is the two flared cut-outs on both lower sides of the assembly.
I have ordered a package of 1 1/8" wheels & several packages of misc rivets, but can't find a perfect fit. The wheels came with compression fitted axles that appear to be a bit too long for this application.
Do I just grind them down to fit ??? About 1/16" +/-.
Thanks so much for you feedback.

The 1 1/8" wheels are not the problem. It is the length of the axles provided with them that appear too long to fit up, into the housing when adjusted. It is those that I am considering grinding down but am afraid they might not securely handle the weight of the door. Would love to change out the entire tandem wheel assemblies, but it appears they are no longer available. I don't want to carelessly start rebuilding & risk rendering the original housings, unusable.
I'm stumped.
Thanks.