Thank you for lookingEKP has 5BA x 1/4" Products - EKP Screws - Manufacturers of Quality BA Screws, Bolts and Turned Parts in the UK
BA Bolts has 5BA x 1/4", but looks like they are brass. BA Grub screws, small setscrews, Ba slotted grub screws, BA Slot Grubs, Ba Bolts, Ba Grubs
Can't find any 1/8"ones, so maybe have to cut down the 1/4" long ones.
The Emerald Isle