That engine looks like something the seller grabbed from a scrap yard, just before it went to China.
Try Diesel Engine Trader instead, not quite so many scammy operators on there, the sellers usually operate engine repair and trading businesses.
Diesel Engine Trader has been connecting buyers and sellers of Diesel Engines and Spares Parts since 2000.
www.dieselenginetrader.com
There's a lot of truck and industrial engines on DET, obviously a lot pulled from parted-out highway vehicles, you will need to contact sellers on DET to see what is available by way of a tractor engine.
You MAY be able to utilise an on-highway engine to rebuild your D7H engine - but I stress, this is a big MAY.
Cat engines are built specifically for their designed task, Cat have 6 main designations - Industrial, Marine, Truck, Genset, Fire Pump, and Tractor.
Each engine is built up using specific components designed for that HP output, RPM range, type of engine loading, and whether weight is a concern. So highway engines have a lot of alloy components to keep weight down.
Each engine prefix number designates how it's built - what pistons, crank, rods, valves, turbo, injectors, and fuel pump/governor is used.
There can be a vast range of different internal components between two similar-looking Cat engines.