Allison 250, GE T58, GTC-85

A good supplier of bits for these units, and whole engines too, is;
Avon Aero Supply. Danville, Indiana. (About 1.5 hours South of Indianapolis.)
Mr. Bruce Linsmeyer. (317)745-6600
Avon Aero Supply. Danville, Indiana. (About 1.5 hours South of Indianapolis.)
Mr. Bruce Linsmeyer. (317)745-6600