I have an Ampeg 8x10 that lacks those hard plastic (?) strips on the back (I'm almost sure they are called 'slide rails'. Correct me if I'm wrong). It just so happens that having rails would be super-helpful to get this cab in and out of my practice space (steep concrete steps). I checked with Fliptops and they don't have 'em. I don't even object if they're not 'ampeg' slides, and I don't mind fabricating a comparable replacement if I can actually make one... more concerned with function, if I can't find Ampeg slides.