Easy, Peasy. All done. Good old C-Clamp to break the bead, pop out the old one and in with the new. Time to go out in Harley week and let the Fat-Girl mingle.
You did replace them with metal ones didnt you?
Nah, I had some old rubber ones I pulled off an old Pan-Head about 30yrs ago.

Actually, in the first post Big Bike Parts Stems. Not-rubber.