1975 Raleigh Grand Prix FD Clamp Size

raleighinternational

Dirt Disciple
So I need to replace the FD on the Grand Prix and want to get the right size clamp for it's skinny 20-30 tubing.
Some Ebayers are listing a 1" clamp FD for Raleighs. The original was a delrin Simplex, long gone and I chucked on an old Suntour temporarily from the parts bin but doubt if that was the right size. Anyone with a definitive answer?
 
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