Herbert or Coventry die head

I have a lot of new thread chasers,(over 150 sets)different sizes

For the 1/4 inch (Dimensions of the chasers 3,9 x 7,94)
I have no die head, and it seems to be impossible to find

If anyone is interested in those chasers, here a list, all are new,
Different types and dimensions

Alfred Herbert Chasers for a 1/4" Coventry / Herbert Die Head (3,95 x 7,95)
Metric:
M2,3 x 0,4 x 2st
M2,5 x 0,45 x 8st
M4,0 x 0,7 x 15st
M4,0 x 0,75 x 2st
M3,0 x 0,5 x 3st
M3,0 x 0,6 x 1st
M5,0 x 0,6 x 1st
M5,0 x 0,8 x 4st
M5,0 x 0,9 x 6st
M6,0 x 1,0 x 2st

UNC
0,86/56 x 2st
0,20/56 x 2st
0,112/40 x 15st
0,164/32 x 9st
0,19/24 x 3st
1/4/20 x 13st

UNF
0,112/48 x 6st
0,138/40 x 1st
0,19/32 x 18st
1/4/28 x 20st
0,321/24 x 5st
0,375/32 x 6st

Alfred Herbert Chasers for a 3/8" Coventry / Herbert Die Head (6,35 x 12,7)
M3,0 x 0,5 x 3st
M8,0 x 1,25 x 18st
M10 x 0,5 x 3st
M10 x 1,5 x 4st


Alfred Herbert Chasers for a 1/2" Coventry / Herbert Die Head ( 6,35 x 12,7)
M4,0 x 0,7 x 3st
M5,0 x 0,8 x 4st
M12 x 1,75 x 3st

Alfred Herbert Chasers for a 1/4" Coventry / Herbert Die Head ( 9,54 x 22,2)
M10 x 1,5 x 1st
M12 x 1,75 x 5st
M14 x 2 ,0 x 1st
M16 x 1,5 x 1st

1/4 BSP/20 x 3st