Screw (4x12L or 4X8L?)

Listed on the following equipment:
Advanced Fitness Group - 2.7AT - TM685D - 2015
Advanced Fitness Group - 3.5AT - TM659B - 2015
Horizon - Goal Series - GS1050T - 2010 (TM627)
Horizon - Horizon - CT5.1 - 2010 (TM625)
Horizon - Horizon - CT5.3 - 2012 (TM660)
Horizon - Horizon - CT7.2 - 2013 (TM685B)
Horizon - Horizon - GS950T - 2010 (TM626)
Horizon - Horizon - T100 - 2011 (TM629C)
Horizon - Horizon - T101 - 2010 (Before SN TM6211006CL00400)
Horizon - Horizon - T101 - 2011 (After SN TM6211006CL00401)
Horizon - Horizon - T101-03 - 2012 (TM659)
Horizon - Horizon - T202-03 - 2013 (TM685)
Horizon - Horizon - T701 - 2009 (TM616)
Horizon - Horizon Series - Evolve SG - 2009 (TM605)
Horizon - Horizon Series - T90 - 2009 (TM617)
Horizon - TREO Fitness - 30750 - 2008 (TM270B)
Livestrong - LS7.9T - 2010 (TM637)
Livestrong - LS8.0T - 2011 (TM641)
Livestrong - LS8.0T - 2011 (TM641B-2KM)
Livestrong - LS8.0T - Canadian 2011 (TM652)
Merit Fitness - 710T - TM270 - 2007-2009
Merit Fitness - 715T - TM610 - 2009
Merit Fitness - 715T Plus - TM 397 - 2011
Merit Fitness - 720T - TM228 - 2007
Merit Fitness - 725T - TM611 - 2009
Merit Fitness - 725T Plus - TM398 - 2011
Merit Fitness - 730T - TM267 - 2007
Merit Fitness - 735T - TM629 - 2010
Tempo Fitness - 611T - TM620 - 2010
Tempo Fitness - 612T - TM451 - 2012
Tempo Fitness - 621T - TM615 - 2009
Tempo Fitness - 622T - TM452 - 2012
Tempo Fitness - 632T - TM667 - 2012
Triumph - 400T - TM397B - 2011
Triumph - 415T - TM610B - 2009
Triumph - 700T - TM281 - 2007

* Images may not be identical to part.