#520 - LGTH: 32 3/4" - 17 lbs. Top Flange: 12 1/2" w. X 7 1/2" dp. Bottom Flange: 6 5/8" w. X 7 3/8" dp.

Western Star side frame

Top flange is an "L" shape with 10 holes, two with5/16" N.C. threads and eight drilled clearance for5/16" bolts. Bottom flange has 12 holes, four with5/16" N.C. threads and eight drilled clearance for5/16" bolts. Various other holes for shroud andbrackets, etc.NOTE: Frames are not interchangeable. Order left fordriver's side or right for passenger's side or pairs.