I don't think you should have a stolen seat on any cub--buy your own and put it on! Oh, wait, you said steel seat....not steal a seat.
Ok, in that case, you could buy a seat that a puller uses. I think they are aluminum. It isn't a pan seat, but often a flat seat that will allow you slide from side to side and shift your weight. Like this one:
http://www.ebay.com/itm/CUB-CADET-JO...item19e46fc2a7
Cub Cadet 123
BTW: I like your white air cleaner assembly on your 102. Is that factory colors on it?