Not sure which forum this belongs in so here goes:

Bought a Thermalright Silver Arrow SB-E Extreme high end air cooler, one of the few air coolers capable of handling an overclocked Devil's Canyon i7-4790k.

Was missing an Intel backplate nylon washer.

Emailed Thermalright customer support, and within the space of a few days received 2 replacement washers in the mail.

Kudos to Thermalright for doing the right thing and great customer support