Original Silencer Specifications:
BMC part number: ARH 105
Single wrap welded construction.
Single pass adsorption type with glass wool
Round body with side lock seam
Gauge of body: 18 SFG
Gauge of end plates: 18 SFG
Dimensions: 21" x 5" diameter
End Sleeve sizes: Inlet 1-7/8" ID -- Outlet 1-3/4" O.D
Inside pipe perforations: 3/32" Diameter, 1/4" x 1/4" staggered pattern
Tail pipe: Part No. ARH 1225, 1-21/32", 18 SWG 7-1/2" long
    (fits inside of silencer outlet when this is a separate piece)

At some point it appears the Twin Cam silencer rear outlet tube changed to 1-7/8" OD (single piece) same size as the inlet pipe, so the hole in the rear hanger may need to be enlarged from 1-3/4" to 1-7/8".

Here is a Walker muffler with a generic part number that, may be available at a local muffler shop. -- Walker 82 91 24


One that might be close:
Walker SoundFX Universal 17848
Body 5" Round x 19" Long, 24" Overall Length, 2" Inlet, 2" Outlet.

One that was installed in an MGA (not exactly as original):
Walker Pro-Fit 17898
Body 5" Round x 19" Long, 24-1/2" Overall Length, 1-7/8" In, 1-3/4" Out.

Pipes are offset to opposite sides, should be offset same direction in line.

Advantage to having the tail pipe separate is that it can be rotated to desired orientation.
y the heat on that cable will not be a problem. So far I can't discern any problem with it dragging.