I have found some poly body bushings that work on our M715 applications.
Energy Suspension part number 2-4101G comes with 14 poly bushings, for around $22.97 (Summit Racing). Dimensions are (1.955in O.D. X 0.65in Height X 0.567in I.D.)
Fender washers from Fastenal (3/8" I.D. x 2" O.D.), $5.61 for 25 washers.
Bronze bushing from Granger (3/8" I.D. x 1/2" O.D.), part number #12R725 $17.25 for 15 bushings.