I got some Ferodo DS2500 from Addiction Motorsport. They have a modified Ferodo DS2500 pad from the Boster S caliper that fits the NQSBBK caliper and sweeps the entire disc. I found them on their eBay store and emailed Thomas there and asked if they could do a matching pad for the rear as they weren't advertised. He did and sorted me out a good deal.
Do make sure you have/get the Porsche anti squeal shims too from somewhere.