Certainly, contact the Howard Register. In the mean time, the 2000 replaced the Kelpie in September 1962. It was powered at first by the Howard LH engine.
Some time in 1963 the Howard 408 or 2408 (haven't sorted that one out yet) was introduced.
There were Briggs & Stratton and a diesel options during the life of the tractor. Can't tell what make yours is, as the Howard and B&S engines were similar in design.
V belts would be standard ones found at your local v belt supplier.
Eric