This is Chineese stuff, but aparently many have been having good luck with it. I'll be ordering a 12mm H&R from them to build my hotrod pump out of.
http://stores.ebay.com/Chinahanjipartsplant
Thanks to Volvo242diesel, this is the part number for the head and rotor (or the p.n. of the pump it comes from) 1 468 336 626
Jason