FWIW, while that PowerMaster starter is somewhat more expensive, it is a good starter. I got that starter, very stout batteries, & made 1/0 cables to help my 19:1 comp ratio engine start in winter's coldest temps.
That thing really spins things over. Sounds as rapid or faster than the newer diesels w/ gear reduction starters.
1995 K2500, 8600 GVWR, 6.5TD, NV4500, 3.73:1, 18:1, balanced, Fluidampr, DSG timing gears, '97 cooling upgrades, 2100 psi-pop injectors, 4" exhaust, ceramic coated exh manifolds/turbine housing/SS crossover pipe, Autometer: pyrometer, boost, oil temp, oil press, fuel press, & water temp gauges, remote oil filter, B&M plate-style oil cooler w/ braided SS oil lines