From hub to fork crow mount measures 37cm. I think stays over 35cm would do the job.
I also need a fork crown mount (think that's the right term). The fork has an unthreaded hole front to back and it looks like a bolt needs to go through there and grab the mount tab on the mudguard. Ideally with those curved washers on either side. If you have spares of those that would be brilliant.
I'm not too worried what type of fitting the stays have on them, even just a plain metal loop is fine.
I need the LBS to tap out a hole for the rack mount at the back where the thread has gone (previous frame owner). I might see if they have any spares in their box.