I've replaced mine as well. It should be a snug fit, but easy to take on and off. Then the cloth tape tightens it all up, but more importantly protects the backglass art from being scratched by the metal channel. If the doesn't fit, don't force it, it's probably the 1/8". I had an extra 1/8" because that's what my Flash Gordon (Ballly) needed. I thought I could use it on Gorgar or Blackout (Williams)... no way. Too tight! It will visibly look smaller than the glass edge if it's the 1/8". You should also be able to measure the opening in the channel to confirm the size.