Wheel size different

I googled the U.S. Pat. 3.041.657, which has No. 454 above the 3/4 front and 1 3/8 rear with a rounded/convex edge wheel and was directed to Swisco part #23-031, which has No. SBI above the 3/4 front and 1 3/8 rear with a squared off edge wheel.

The conversion of U.S. Pat. 3.041.657 did not work because the wheel on the new item would not fit properly in the tracks.

I am looking for a replacement that will work.

Please advise.

Sincerely,

Tim 

Attached are pictures of the wheels from the original (old) and the replacement (new). I hope this helps in determining the correct replacement parts I need.

Thanks,

Tim