Screw (4x12L or 4X8L?)

Listed on the following equipment:
Advanced Fitness Group - 2.7AT - (TM685D)
Advanced Fitness Group - 3.5AT - (TM659B)
Horizon - Goal Series - GS1050T - (TM627)
Horizon - Horizon - CT5.1 - (TM625)
Horizon - Horizon - CT5.3 - (TM660)
Horizon - Horizon - CT7.2 - (TM685B)
Horizon - Horizon - GS950T - (TM626)
Horizon - Horizon - T100 - (TM629C)
Horizon - Horizon - T101
Horizon - Horizon - T101
Horizon - Horizon - T101-03 - (TM659)
Horizon - Horizon - T202-03 - (TM685)
Horizon - Horizon - T701 - (TM616)
Horizon - Horizon Series - Evolve SG - (TM605)
Horizon - Horizon Series - T90 - (TM617)
Horizon - TREO Fitness - 30750 - (TM270B)
Livestrong - LS7.9T - (TM637)
Livestrong - LS8.0T - (TM641)
Livestrong - LS8.0T - (TM641B-2KM)
Livestrong - LS8.0T - (TM652)
Merit Fitness - 710T - (TM270)
Merit Fitness - 715T - (TM610)
Merit Fitness - 715T Plus - (TM397)
Merit Fitness - 720T - (TM228)
Merit Fitness - 725T - (TM611)
Merit Fitness - 725T Plus - (TM398)
Merit Fitness - 730T - (TM267)
Merit Fitness - 735T - (TM629)
Tempo Fitness - 611T - (TM620)
Tempo Fitness - 612T - (TM451)
Tempo Fitness - 621T - (TM615)
Tempo Fitness - 622T - (TM452)
Tempo Fitness - 632T - (TM667)
Triumph - 400T - (TM397B)
Triumph - 415T - (TM610B)
Triumph - 700T / 720T - (TM281)

* Images may not be identical to part.