Many posts on this site said that SWISCO P/N
81-141 is a direct replacement for the TRUTH P/N 30410. IT IS NOT!!
The TRUTH roller P/N 30410 has mounting tangs on the unit's bottom - The SWISCO roller P/N
81-141 has mounting tangs on the unit's top.
Although the SWISCO is an exact copy (dimensions, etc) of the TRUTH ... it won't fit!
I sent the P/N
81-141 back and ordered P/N 81-018, which has identical dimensions as the TRUTH, but with bottom tangs.
I'm smarter and UPS is richer!