Look for a shop that carries South Bend - at least they will know a clutch from a piston crown. Hod rod performance diesel shops is a good start. Not saying you need performance - I am saying these shops typically know what they are doing over a general mechanic shop.
It's a ways, but, Pueblo or Colorado Springs may be worth the trouble to get your truck to. Sometimes it is more than just a clutch and the shop's experience can save you from dropping the trans a 2nd time.