36" Long MK3C Spring and Pulley assembly.  suits PN57/1 Spring Box.

To Purchase Pulley & Pin Separately see APG311

Door Sizes: (width by height)
7'0" x 7'0" (Horizon only)
7'3 1/2" x 6'4" (Carlton only)
7'5" x 6'6" (Carlton only)
7'6" x 6'6" (Horizon and Carlton only).
Old Garador part number S1703001-3-2, new part number 4740.