mk2 PB injectors into MK1 Kjet head, what inserts??

hi peeps, i got a Mk1 1.9 gti engineering engine, thats going to be running digifant injection. What injector inserts do i need, as the mk1 inserts (red in colour) have a larger external thread size, but a smaller internal size? And the digi ones i bought from VW dont fit the head as they are too small, however, they fit the injector.

Basically, if there is one that'll fit, i'll buy them, or if not, i need to know the part numbers for the standard kjet ones, so i can bore the centres out to what i/d i need?

cheers.

P.S the inserts that were fitted were sort single piece ones,