Yep,if you can successfully cross reference the part numbers - There is no readily available cross reference but if you know your tractor model and deck size and can "guesstimate" a comparable MTD or Cub Cadet (more likely cub cadet or troy-bilt) model and use that parts lookup, comparing the assembly diagrams and construction, chances are you can match up the MTD part number - Mileage may vary doing that but you can always add that cross reference to your local system, once you can physically confirm parts match up.. Only downside is if they don't match you might end up with inventory you might not sell for months or years (if ever). You'll probably be looking for a comparable X60R model with a G series deck (which should be a 42" I think)
*EDIT TO ADD*
similar example:
https://www.ereplacementparts.com/cub-c ... 34032.html I looked it up by a fuzzy google search for "2014 G series deck cub cadet" which coughed up the cub cadet "XT series" and I just picked one at random, dunno how similar your parts list is, but you get the idea...
*Edit #2*
Another Hint - scrape the blades good and examine other deck pieces to see if you can find any MTD part numbers on them, can use them to look up in "fits model" area of parts lookups, which may help narrow things down..
How poor are they who have not patience. What wound did ever heal, but by degrees? - Iago (Othello Act II, Scene 3)