G'day Mark,
Can't help you with those part numbers unfortunately, as I don't have the Victa 'Green Book' Parts Manuals, which cover their models from 1955-1972.
The spring and ends were listed as an assembly, not as individual parts, though.
In any case, the chances of finding NOS parts would not be too good.
As far as I know, Victa only listed parts by individual mower model - there was never a cross-reference by part number as you describe.
Part number supersessions were mostly found in Victa's spare parts price lists, back then. The old part number would have a reference to the new one, in place of a price.
Victa did change their part numbering system in the 1970's, from numerical only format [x-xxx or xx-xxx] to the two-letter prefix/single letter suffix format. As I recall, the suffix letter denotes revision version.
