Back when I got this kit 12 or more years ago there were no buffer heads in with it. Apparently they were supplied by Ron Chaplin and he had just retired.
I really should have pestered Dave Shap for some replacements but time went on and it’s too late now. To get around it I imported the drawing into Fusion 360 and scaled it I then drew up the head to get dimensions and from there a happy few hours were spent turning some from some mild steel bar.

I wasn’t thinking when I picked up a 6ba screw/nut thinking it was 8ba. I drilled out the buffer castings to take 6ba before realising my mistake so I made the buffer heads to take a 6ba nut. Fortunately I found some suitable springs.

They just need blackening now.