I have clutch-head screws in the door-latches on my T.F.'55. The doors needed to be adjusted,and i found the bits in a "security-tool" kit,at Harbor Freight. The kit consists of 36 pieces,only three of which are clutch-head,but the sizes included
with this kit,are the sizes used on my '55. for the price of the kit,I believe it's a good investment. Hope this helps.