So, swapped over the air spring for my pal last night on a set of these mega-bargain forks. For anyone who has bought a set, I would highly recommend giving them a service as:
The grease was like congealed balls of snot
There was almost no oil in the lowers
I can confirm it’s definitely not the latest air spring. It has the anodised red head, but it’s the smaller one and it has the shorter foot nut. I put a new c1 180mm air spring in and gave them a clean/grease and some new oil and the seem to be feeling good. My friend is selling a set of Fox 38 Performance (180mm) if anyone is interested.
Thanks again for this PSA. Definitely would have missed these otherwise!