The part number system for Torflex axles is very similar to that ot the tubular axles. Please place you order according to description based on the following information/example.
EX: 12TF70-865E-EZ; #12 Torflex, 7,000 lb., 8 Bolt, 6.5" Bolt Pattern, Electric Brake, E-Z Lube
20 / 545 / I / ST / EZ
12TF: Model of Torflex Axle (#8, #9, #10, #11, #12, #12V, #13,#13G, #13D)
70: Capacity of Troflex Axle (70=7,000 lb. capacity)
545: 8 Bolt, 6.5" Bolt Pattern
E: Type of brake, if any. (I = Idler, E = Electric, H = Uni-Servo Hydraulic, HY = Duo=Servo Hydraulic, DS = Disc)
EZ: Any other options ( EZ = E-Z Lube, NL = Nev-R-Lube, OIL = Oil)
It is also necessary that you specify the outside dimension of you frame and the starting angle of the trailing arm.