Mike,
I've used a lot of those nose pieces and you have to grind off the brass around the hole to make them work. Not sure about the hole size for the Slot and Delvis 3D guides as I always use a Parma or JK 1/24th scale guide flag when I used that nose piece. You might have to size the hole down with brass tubing to fit the 1/32nd scale guide flags.
I'm pretty sure those nose pieces are left over from the 60's or at least copies of the Cobra nose piece from the 60's.
Butch