If you're hiring a shop to install your gears, I strongly recommend you have them to provide ALL of the parts needed. Even if it means paying a little more.
If it's a shop and they install your parts, they will likely blame your parts if anything goes wrong during or after the installation... and the usual cause of problems is from the installer screwing the job up. Having them provide all the parts means they can't point their fingers at you or the parts if anything goes wrong. Doing it this way means no warranty headaches.