Will they fit on my '73 "L"?
You could "make" almost anything fit..
But-
Since these are for flat spring gear, the backing plate bolt holes would have to match the tubular pattern...
and....the 73 backing plates ( I think) are different than the earlier type.
There are at least 4 different types of configuration over the 150 production.
The eBay listing omitted the picture of the backing plate shape.