Not sure where to start but these are perfect for my behind the neck headphones. If you look at the pictures, you'll see I've been wearing mine with the plastic (almost 2yrs lol) and no ear cushion, only tape that once held pieces of cushion that finally fell off lol. I have 2 more pairs of these headphones waiting to be used (neither have ear cushions too). If any of you still own a set of these (Cyber Acoustics AC-634), these will fit. They are tricky to get on, but not hard at all. Put on the end that's closest to the head band part, first, then work your way around to the bottom. They are made for circular drivers/speakers (maybe 2" round), but mine are oval (2-1/4" x 2") and they fit great (see pictures). Once they are on, they won't come off. At least mine haven't. The cushions are very comfortable and have more sponginess than the originals. They also give back the mids sound that I lost when the originals finally disintegrated. I will wear these headphones until they die! Most headphones these days focus on the lows (bass) and I don't need lows. I need semi-mids to highs. I'd rather hear footsteps and the important sounds in-game, better, rather than the sound effects (planes, bombs, grenades, etc...). If your headphones are oval like mine that are 2-1/4" x 2", then these should still work for you. Doesn't hurt to give them a try. That's what I did and I'm glad I finally pulled the trigger! These feel very high quality but only time will tell. Get you some! And don't fall for those 20 pairs pack for 8 dollars or whatever they are, because those are thin foam and junk. I didn't fall for those because you can see it in the images and I already know, you get what you pay for, and in my opinion, these are worth it.