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Does anyone know these dimensions for the various model years 1952, 1955 and 1958?

The issue:
I have a Panhead that is titled as a 1952, but has been rebuilt a few times by the previous owners so it is kind of a bastard with parts from several years. I purchased a Rivera Primo primary belt drive, but the belt is to short. The bike has a 1958 (or later) frame because its a Duo-guide frame and the motor has a newer splined crankshaft (1955+, I think?). So when I ordered the kit I ordered a kit for 1955–1964 fitment to get the front splined pulley. The frame comes into play because both the engine and trans mount to it, so that effects the center distance. I don't know if the engine and trans mounting changed between the hard tail and the Duo-glide model years? The kit came with a Kevlar Polychain belt, 1-1/2" wide, 11mm pitch. 101 teeth. I talked to Rivera tech support the 101 tooth is the longest they offer. They did tell me they buy the belt from Gates. I did contact Gates and am waiting for a call back to see if they offer longer belts.

I am just trying to understand the situation better to evaluate if I can make this work of send it back.

Thanks
Rick
 

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I think they are all pretty much the same.I think the inner primary dictates the distance.
 

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The engine/drivetrain mounting position distance relationship was the same on both rigid and swing arm Big Twins. Before '65, the transmission could be moved fore/aft to adjust primary chain thus the "center to center" distance can vary. In '65 and up the transmission was fixed in position.

Bob
 
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