the Bosio factory is in northern Italy (Torino). i suspect that the dieselsend nozzles are made by Bosio just as an offbrand (probably made by the same machine that makes the original Bosio's); seems unlikely that a small factory would specialize in diesel nozzles (i would think it takes very specialized equipment to make these nozzles). like i said, the quality of these seem to be very good (after 5,000 miles though). his prices are really good too (yet another reason i think they're made by Bosio, a small shop would not make much money on these if they only produced them in small quantities); i think i paid less than $100 for 5 nozzles and a 100 pc set of adjustment shims including shipping. he accepts paypal (he did for me anyway) since i was in the USA and he knows it's hard to do a wire transfer to Germany, and he doesn't charge the VAT.