I got mine at NAPA. I walked in and they asked me what I needed. I held up the valve and told them "a metric bleed valve, 7 x 1.0, about this long." One guy starts looking through his five foot long row of catalogs, the other guy walks about two feet into the rows of shelving and comes out with a metal box. He opens the lid, scans the labels on the inside, and pulls out a duplicate of what I'm holding. I tell him "perfect, I'll take two." Catalog guy turns around and has a "yeah, well, there you go" look on his face. It cost about $5 for the pair. If they have them, get covers, too.
~john