mesa performance parts has solex pph rebuild kits at better price than the Alfa-Romeo repair shop that distributed the Royze kit.
alternatively, i found an eBay seller (from Italy) who supplies rebuild kits. i bought a couple kits for the Solex DDH carbs and they were reasonably priced considering....
also go to www.bmw-02-club.de/faq
for a nice selection of german articles on the 02's in general. the articles can be translated automatically and there's good info on PPH's, DDH's and kugelfisher stuff.
hth