having a serial number from the dataplate would be helpful
but with that said they only show one diesel engine for this truck which is an S6S Series.
The CAT part number for the starter for this engine is: 32B6610301 starter assy.
There is also a bracket that goes with this starter so in case the one on your truck may be missing or broken here is the part number for the bracket also: M642X34071

You may can get the starter through TVH as a reman but the bracket is probably only available through caterpillar.
Note: TVH reman starters are a 50/50 chance you'll get one that is dependable. If you want to be sure just go OEM and get everything from caterpillar. You may be able to google those part numbers and find one from an independent seller.