1510 backhoe sub frame

[Don in Hickory]

I have a 1510 and recently bought a Bush Hog 665H backhoe. The backhoe and tractor are equiped with a 3 point hitch. I'd like to change the backhoe to a subframe mount. Anybody have a subframe that I could get measurements from or buy one if available. Any help would be appreciated as I really don't want a 3 pt setup as I'm alittle afraid of stress damage to my little beast.