Mine are in the exact same location... Only they are very short "cuts" of Earl's Blue automotive/Silicone hose that's rated to 250psi or 500psi at 500f? Or something like that.
Tough stuff, used for pushlock fittings on fuel lines, oil lines etc.
It was free, in that I keep scrap hose in a tote with nothing but scrap hose/spare hose, so I always have some hose around. (Never goes to waste, and no, I'm not a hose horder... LOL)
Just take a sharp knife, or in my case, I use my Craftsman sheers to snip the hose nice and thin, so using two buffers, they don't affect the action working correctly, or the last round hold open, but it does reduce the clang, and keeps the brass closer, and more in a general area v/s all over the range.
The "Wilson" 1911 buffers I tried lasted less than 250 rounds before it split on the front, and was totally missing from the rear. Have no idea where it went, it was not inside the action/stock either. Must have broken into a few pieces, and been lost out the rifle somewhere.
The Earl's mod holds up fine, my front ring at the gas port shows some signs of the blue outer, and black inner hose being seperated, but since it's cord reinforced, and bonded pretty good, it's holding up now at over 500 rounds. It's dirty, but there. The rear buffer shows some deformation to the shape of the action, but that's it. NO worse for wear at all.
They are much softer than the Wilson plastic ones, and I think that's a benefit. It absorbs the energy, and that's the idea. The bolt cycles fully, and it works fine.