Originally Posted by Denny Graham
..McMaster Carr. 1/4 Hex drive, odd lengths:
http://www.mcmaster.com/#catalog/117/2811/=bzzp23 stocked in 3/32, 1/8, 5/32, 3/16, 1/4
Here are the MCMaster Carr part numbers to use in the future if the catalog page link changes.

Short 1/4" Hex Shank insert bits:
7188A31 Clutch-Head Insert Bit 3/32" Size
7188A21 Clutch-Head Insert Bit 1/8" Size
7188A23 Clutch-Head Insert Bit 5/32" Size
7188A24 Clutch-Head Insert Bit 3/16" Size
7188A32 Clutch-Head Insert Bit 1/4" Size

Longer 1/4" Hex Shank insert bits:
69815A51 Clutch-Head Power Bit 3/32" Size
69815A45 Clutch-Head Power Bit 1/8" Size
69815A46 Clutch-Head Power Bit 5/32" Size
69815A47 Clutch-Head Power Bit 3/16" Size
69815A52 Clutch-Head Power Bit 1/4" Size

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-