cb750f carb insulators

[william.objective]

So, since there are no cb750f 77 carb insulators out there and those parts are rare and expensive for most other cb750's, is there a DIY version from large diameter tubing/hose that would work? I have been digging and digging on the intarnet for hours and nothing. Any constructive input would be great.

I did read of a "solution" that involves a chemical soak of wintergreen oil and xylene i believe but seems that would temporarily soften the rubber.

Thanks

1977 cb750f