We’ve been fortunate to track down a set of these static ports (in the USA). There are a couple of other parts that are needed, as follows:

Type P.11 Compass and the appropriate corrector
Boost Gauge Mk 3 (-4/+8) 6A/1221
RPM Gauge, Smiths Mk4, 6A/1299
Mk 14 or Mk 19 (6A/5040) Altimeters (2 off)
1 off coaming that goes across the top of the instrument panel

If anyone has or knows of any that are available, or any other Provost parts for that matter, please drop me a line. Thank you.