I'm thinking about swaping the front inserts in my FK coilovers for the Koni adjustable type. I've enquired about this but I've been told I need a part No from the originals, which i don't have, as my current ones are non adjustable. Does anyone know the number of the adjustable ones

Looks like no-one can help with this. So can someone measure the diameter of the strut of a Gaz or KW Coil-over I'm wondering if the inserts from one of these will fit.

Gaz certainly won't fit.

Although it pains me to mention them, Gazella sell the FK dampers and will be able to supply the correct Koni insert.

http://www.gazzellaracing.com/product.php?productid=18347&cat=2781&page=1