May contact Husqvarna. The LT12 was not sold in the United States. They offered the LT120 during the early 90's which was a 12 hp tractor that had the deck lift built into the right side fender.

any luck?? ive the same mower and im looking to find out how to put the belt on .. do i have to drop the whole bottom deck off it ??

Likely not, but it would be easier to do so. 5 or 6 pins maybe.

Try this, very close to what you have LT12 Manual