The one small red piece appears to be a shoe from a long lost push blade that may have been a part of your dad's Cub accessories.
" Jen Sales" is a mail order publishing house in MN. That firm carries just about all catalogs and information on tractors, etc. Each line entry carries the Make, part etc.
I don't know how the ordering works today, as I got my catalogs by ordering them over the phone The order was more than 20 years ago