Speed Bleeder source and sizes

[Nanonevol]

Rebuilding all four calipers on my '77. I purchased Speed Bleeders but they're too large for my calipers. My bleed screws are tiny - I think they are an M6. I can find these on line but I can't find the piece they screw into and don't know what it's called which might help. I think these need to be an M10 x 1.0 - so it's basically a short bolt with a hole in it. Anyone know where I can get these? In a pinch I can use my old crusty ones but I do need at least one because a PO had a plain bolt in there - no bleeding on that caliper!
Edit: Or is the bleed screw supposed to screw straight into the caliper and mine were likely drilled out and tapped for repair? No, I guess not - it needs the...seat!
Edit: Wrong again! Showing my brake caliper newbie ignorance here. Originally, bleed screw went straight into the caliper. In my case all four were "repaired" by drilling, tapping and putting in a "seat" and in one case, a plain bolt!
My oil drain plug was also badly stripped. Ham fisted mechanics make me angry!

[DieselSpider]

I find them on the shelf at the local parts stores.