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#7241 - LGTH: 36 1/4 - top&btm flanges: 6 1/2 x 9 3/8 dp.- 27 lbs  
Peterbilt side frame
#7241 - PB side rails, top & btm flanges: 6 1/2" x 9 3/8" dp., Top and Btm flanges each have 12 holes, 2 tapped 5/16" NC and 10 drilled clearance for 5/16" bolts. Engine side of rail is flush with flanges with seven 1/4" NC threaded holes. Six 1/4" NC threaded holes on side. Two brackets on rail - one for CAC and one for mounting pin. NOTE: Frames are not interchangeable. Photo shown is Left side
#724 - LGTH: 36 1/4" HDR: 6 1/2" w. 9 3/8" dp. 
Peterbilt side frame
Top and bottom flanges each have 12 holes, ten drilled clearance for 5/16" bolts and two tapped 5/16" N.C. One bracket on side of channel near top with two holes drilled clearance for 1/2" bolts. Angle brackets on each side of channel with 1/4" N.C. threaded holes.

 Note:   frames are not interchangeable. Order left or right accordingly.
#723 - LGTH: 41 3/8" - 23 lbs. Top & Bottom Flanges: 8" w. X 9 1/4"dp. 
Peterbilt side frame
Flanges on both ends have 13 holes, all clearance for 5/16" bolts. One angle on each side, full length with five 1/4" N.C. threaded nuts on each. NOTE: Frames are interchangeable.
#722 - LGTH: 37 1/2" - 20 lbs. Top Flange: 13" w. X 7" dp. Bottom Flange: 8 3/4" X 5 3/4" dp. 
Peterbilt side frame
Top flange has 13 bolt holes drilled clearance for 5/16" bolts. Bottom flange has 9 bolt holes drilled for 5/16" bolts. One angle mount on grille side. Various other holes for brackets, etc. NOTE: Frames are not interchangeable. Order left for driver’s side or right for passenger’s side or pairs
#721 - LGTH: 30" - 20 lbs. Top Flange: 9 5/8" w. X 7" dp. Bottom Flange: 7" w. X 5 3/4" dp. 
Peterbilt side frame
Same as model #720 except shorter. NOTE: Frames are not interchangeable. Order left for driver’s side or right for passenger’s side of pairs
#720 - LGTH: 37 1/2" - 20 lbs. Top Flange: 9 5/8" w. X 7" dp. Bottom Flange: 7" w. X 5 3/4" dp. 
Peterbilt side frame
Top flange has 11 bolt holes drilled clearance for 5/16" bolts. Bottom flange has 8 bolt holes drilled clearance for 5/16" bolts. One angle mount on grille side. Various other holes for brackets, etc. NOTE: Frames are not interchangeable. Order left for driver’s side or right for passenger’s side or pairs.