mean clutch head screwdriver, Mike? check NAPCO, or any of the repro parts places, or SnapOn or Mac
if you mean like a bit to use in a ratchet, the tool places prolly have'em - there's 3 sizes, and usually the screwdrivers are sold in the set of 3

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics