Mk1 golf injector seats for dx head thread size ?

Hi was wondering if anyone could help me find out what the pitch thread size is on the injector seats on a dx engine as I know the diameter which is 24mm but need to find the pitch?  The reason for this is I need to buy the correct tap to see if I can re tap the threads as they are a little bit damaged.
Any help would be greatly appreciated thanks 

Is this the  type you mean, the brownish plastic ones?

If so, this particular one's 1.5 (and also 24mm diameter).


 

Yes that's the one thankyou much appreciated 👍🏼

are they not brass ?

nicci21paul said

are they not brass ?

I've only seen Phenolic.

Brass have a larger internal diameter to allow shrouded injectors to fit, the 'top hats' make them that bit wider.

There's different plastic caps fit to the brass version to seal the injector hats.

There's also a version that's longer than the one pictured and entirely plastic, sort of halfway house between it and the brass one… seems to have been very short lived, 1984 for a year or thereabouts.

If anyone has the version below (image filched from the inter-web) may be they could answer something for me…

What is the diameter of the threaded part at the top… is it 24mm or 22mm?

24mm inserts should only fit non-shrouded heads whereas the 22mm brass inserts are for shrouded heads only (over and above the injector / ID differences).

Cheers…