@Kevin @Sweet If you can’t locate the grit bead, you can get a similar flash by coating regular beadheads with glitter nail polish. Most of this stuff is a clear base with tiny bits of flashy glitter mixed in. I just “borrowed” some and painted a few beadheads with it. Looks pretty good to me.
On FlyFlasher.com you can find 30,417 flies from all over the world. Flash your own fly patterns, upload your current work or search for inspiration. The flies are tagged, so you easily can search for them.