The orange ones are silicone O-rings. You can get a bag of 100 for like $8 at McMaster. They will work, but most people think they don't work as well as some of these more expensive ones. They can handle heat up to like 600 degrees, so they won't melt, and no residue. I bought a bag and gave to a friend to try on his Manley amp. He compared them and ended up tossing them out for Herbie's. I've not done too much comparison as I used them all. I used the O-rings in places where Herbie's are too bulky.
FrankC
FrankC