I was hoping just for a straight-forward bolt on job with perhaps a wee bit of effort but it sounds liek I'd be better off just getting the correct "Hyundai Accent" air filter for it...
I'm going to phone K&N tomorrow to see if they can do anything for me over the phone - emails basically tell me that should send it back to the eBay vendor for a refund, however, he has sent me the correct one according to their information and he doesn't have an Accent filter..
If I get no joy - there will be a K&N panel filter for sale in for sale forum