I ordered a set of his Sprint 520 nozzles for my 98 jetta tdi. I spoke with Paul (the owner) personally on the phone. He really helped me get my nozzles fast. He even overnighted them to me, from colorado to missouri. I am a very satisfied customer.
I too have Bosio nozzles in my car and love them; let me know if you want me to help you source any. Or you can call the 877Kermatdi number and talk to Paul

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Good luck!
-BB
whats special about these nozzles? how much do they cost?
KermaTDI sells Fratelli Bosio nozzles that are made in Italy. Super-high quality and the price is reflective of that. I had PP520s in my Passat and loved them. I have a set of his GTD nozzles awaiting installation in my Whistle Pig. But first I must put in more air. Then fuel. Then more air.
I guess they are a bigger nozzle, maybe a different spray pattern than the original ones in the aaz engines. They sell for $125 a set, with free shipping!
I think i am going to try them. Cant be any worse than the worn out injectors in the car now.
Let me know how you make out. I've been looking at a set for old "Rattle & Haul".