Road Racing Duster 6.4 Hemi E85 6 speed Ms3 Pro Evo EFI

Pondering if this might work or something similar. The TB isn’t really round so hmm

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I don't know if it will work for you, but when I break a throttle cable, I don't buy a new one, I just get one of those and a bicycle brake cable. If you can get the pictured end hooked up, chances are you can finish the install with a bike cable. FWIW brake cables are thicker than shifter cables.