Nice find on the 1250!
I have a set of iso-mounts I removed from my tractor. I'll try to remember to measure them for you.
The bolts are 3/8" x 2 1/4" long. There is a metal sleeve that goes inside them. The iso mounts are the same top and bottom. So anything approx 1" with a 1/2" hole to accomodate the sleave should work.
You could also remove one of your top mounts and use it as a guide. They usually aren't too badly worn.
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-Jason
Cub Cadets: 1200 | 149 | 1650 | 122 | Z-Force S 54
Implements: QA42A | Push Blades | #2 Tiller | Rear Blade | 223A Utility Trailer | And a few mower decks
Gravelys 5260 | CI Walk-behind (Project)
And a couple of Subarus 
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