Can anyone remind me of the length and thread size of the two head bolts for the isolator mount

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7/16 x 2 3/4 UNC ?

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some would say that it is AMC .
others have posted that ANC is the same as UNC
I thought that the thread angle was different but just googled and looks to be the same
google Anc thread angle search

"Summary of Thread Included Angles
Thread data
UNF, UNC, ANF, ANC 60°;
.
BA 47½°;
Metric or ISO 60°;
BSW, BSF, BSP 55°;
Acme 29°;
British Standard Cycle Thread (BSC) = Cycle Engineers’ Institute (CEI) 60°."

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Buell Ulysses XB12X 06/08

I'm late to the party , but those are 7/16-14 x 2-3/4 if I'm correct

Bought some f911 bolts in that length on eBay some year ago and they fit the Spondon engine mount perfect with the area under the head unthreaded.

Have to install them but that's happening soon on the rusty X1 red racing stripe!

As a alternative you could get some in 3 inch length and cut 1/4 off with a hacksaw.
https://www.ebay.com/itm/154368334055?v ... p_homepage

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The sound of a V-twin engine braking is music to my ears!!

All sorted now 👍🏻

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