I called and spoke to K-Tec and they said they're currently looking for a new supplier of this manifold. The chap assigned the job is on holiday for the next two weeks but they're hoping for an update when he gets back. They said they'll update their website as soon as a new supplier becomes available, but I'll call them again in 2 weeks and see if they know any more.
I didn't realise the one in the ebay link was a Toyo. I did also try calling Toyosport direct this morning but no answer - strange that their Renault exhaust section on the website is completely empty.
It's frustratin enough having to replace due to the split flexi problem, let alone not being able to source a new SS one.
Let me know if you hear anything and I'll do the same mate