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#836 - LGTH: 34 15/16" - Flanges: 7 3/4"w. x 5 1/4" dp. 
Mack Advance side frames
Flanges have 11 bolt holes, five are 5/16" N.C. There are five 5/16" N.C. threaded nuts on each side of the rail. Six 3/8" N.C. threaded holes on the back.

Note:  rails are interchangeable left or right.
#831 - LGTH: 32 1/2" - 24 lbs. Flanges: 7 3/4"w. x 5 1/4" dp. 
Mack Advance side frames
Each flange has 11 bolt holes, 5 drilled 5/16". There are two slotted holes on the back of the rail. Seven 5/16" N.C. nuts on back of rail. Four 3/8" N.C. threaded holes on fan side of frame. NOTE: Frames are not interchangeable. Order left for driver's side and right for passenger's side or pairs.
#830 - Advance Side Frame Lgth: 32 1/16" - 16 lbs. Top Flange 9 1/2" w. X 4 5/8" dp. Bottom Flange 6 3/4" w. x 4 5/8" dp.  
Mack Advance side frames
Top flange has 11 holes, 6 drilled clearance for 5/16" bolts and 5 taped 5/16" N.C. Bottom flange has 9 holes, 6 drilled clearance for 5/16" bolts and 3 trapped 5/16" N.C. Total of fourteen 3/8" N.C. threaded nuts on channel, 5 on each side and 4 on flat side of channel. NOTE: Frames are interchangeable.
#8015 - LGTH: 35 1/8" - 18 lbs. Top Flange: 10 3/8"w. x 4 5/8" dp. Bottom Flange: 6"w. x 4 3/16" dp. 
Mack Advance side frames
Top flange has 12 bolt holes. Bottom flange has 9 bolt holes, 4 of which are threaded 5/16" N.C. Back of the frame has nine 3/8" N.C. threaaded holes.

 Note:  frames are not interchangeable, order left for driver's side or right for passenger's side or pairs.
  (left side shown here.)