I pulled two grommets out of stock and they have those exact numbers. Both grommets have three pieces included- 2 17" pieces that go around the head (approximately 1" thick) and 1 3" throat piece. Can you tell me what you received?
As far as the Microgel grommets, we think they will fit the newer versions. They might not be a 100% clean fit but should work because of the same head size, string pattern, and string skips.