Executone is on the money. They sometimes need to be wiggled a bit, but I've never had a real problem.
For cat-3 voice jacks @ 8pin, I've always used ICC jacks. Super cheap, keystone compatible, and they seem to fit well.
What type of phone system are you using?
Older Avaya/Lucent phones will work with 8 pin patch cords, newer Merlin and Definity sets (excluding the ISDN sets, which aren't really new...) will use up to a six pin patch cord. All partner sets (to my knowledge) can use an 8 pin cord, as well as the older ISDN sets or I believe MLX sets in the case of a Merlin system.
Correct me if I'm wrong on that...
I think the move from 8 to 6 pin jacks on the phones themselves was due to data networking becoming more and more prominent, so they were trying to de-confuse end users who may have accidentally plugged their phone into a network jack, although I know that most cabling contractors always wire to 8 pin, and for that matter -- most all of them wire to cat 5 or 6 now, so what's the difference.