Tec Gas Shock Extenders

Hi all
I’m after some of the screw on Tec Gas Shock extenders as per the attached photo. I have contacted Tec to see if they stock them but waiting for them to get back to me. Anyone know if they sell them separately? Or any thing that would fit the bill to give me about a 20/30 mm extra on the shock length?

 

If you measure the thread then just get some machined up, nothing special really.

 

All sorted. The guys at Tec got back to me, they do sell them £7. Ordered and they turned up the next day. Top service.