Those rims probably won't work with the 122 fenders either,because your rims have more backspacing than stock Cub Cadet rims.The 122 fenders measure 15-3/8 between the fenders if you use the original seat tower/mount ( the part that the fenders bolt to).In the pictures,it looks like you probably don't have that much. You may have to get some Cub Cadet 8.5 x 12 rims in order to use stock Cub Cadet fenders.
I don't think 26" tall tires will fit under the 122 fenders without raising them up an inch or two.

Ok I think I got it. I'm going to cud 4.25" from the center of the 126 fenders, then weld them back. That will make it 10 1/8 " and fit the model 70 frame perfect. Then Ill just reenforce with 1/8" flat steel for the mounting holes. This should make it fit both height and easily take 26" tires. Or SO I HOPE LoL.
Well I say Me but what I relay mean is My friend Trent, He is a master fabricator, so if anyone can make this work he can.

Wish me luck. I will post some pix as we go.:beatdeadhorse:

Those are 1x6/7 fenders bud :beerchug:

All fixed....:beer2:

Looking good!

Your going to wish your tires are in tighter to your frame.

they will be with the new rims / tires, just waiting on them