Hi PG,
That heater attachment you mention looks somewhat troublesome.
1. My 1930 Town Sedan came with an old aftermarket "Auto-Lite" cast iron manifold heater which was cast in two (2) full length longitudinal halves.
2. It was designed to fit on top of a standard Model A exhaust manifold; however, as designed and as cast, when positioned in place, it can easily move slightly forward or rearward. (Pictures of some are sometimes on e-bay).
3. The two halves are bolted together with two horizontal 3/16" diameter bolts, one near front and one near rear.
4. The former owner had this heater clamped with two (2) 5/8" wide galvanized band with holes, (pipe hanger bands), which passed under the intake manifold and passed vertically over the "Auto Lite" heater, with both upper galvanized band ends bolted with 1/4" bolts passing through the pre-punched band holes.
5. In traveling over back roads and railroad tracks, it would always slightly slide back & forth, become loose, and rattled with a slight noise no matter how tightly it was positioned and clamped because these clamps did not prevent fore and aft movement.
6. I later bought a 1" wide by 1/8" thick aluminum bar, passed it under the "front" curved underside of the intake manifold, and in forming a bent "U" shape, I allowed this bar to extend upwards and forward at about a 45 degree angle at both sides of the heater, extending upwards passed both the left & right ends of the "front" horizontal cross bolt.
7. With the heater carefully positioned all the way rearward, so it "most importantly" could "NOT" move or slide rearward further, I marked and drilled a 3/16" hole through both tops of the "U" shaped left and right aluminum bar in order to achieve a "tight" fit.
8. As such, while being securely clamped downwards in a position where it could not move upwards or sideways, and could "NOT" move forward or rearward, it always stays totally motionless without rattling all winter.
9. In the Spring it is easy to remove the attaching horizontal cross heater bolt, slightly opening the "U" shaped bar and remove same; and lastly remove the heater.
10. If doors and side windows are sealed, and the windshield is well sealed, these heaters can work quite well.
11. Just in case some similar cast iron manifold heaters do not have a front horizontal cross clamping bolt, holes could easily be drilled through the cast iron heater to provide a horizontal bolt for securely attaching the 1" x 1/8" aluminum 45 degree "U" shaped bar.
Hope this helps.
