Part number, clutch slave return spring

["O'Farrell, Fergus" <Fergus.OFarrell@ngc.com>]

Anyone have a part number or the specs on a clutch slave return spring
on a  '69 2000?
I guess if I was going to go the industrial supply catalog route, I
would need the unsprung hook-to-hook length, wire diameter so it would
go thru the holes, and approximate spring tension.
(enough to return the slave position, already too late to have a low
enough spring rate to NOT build a beefy calf muscle)
Anyone ever ordered one from McMaster Carr or someone like that?
Thanks for the help,
Fergus O, 69 2000, HB, CA