Hello, I have a 1981 Delmar single wheel assy, same as your Swisco # 81-148 exactly, except mine has an 1.250 diameter wheel.Looks like Delmar Engineering, Long Beach.
What can I do since I cant find them , except with the 1.125 wheel.
Dave Sr. from SWISCO responded:
November 23, 2016
I don't think that 1/8" difference will be a problem. You can always make up the difference by adjusting the roller appropriately.