Well I have both ... yes I am blessed. I misplaced my slider (it was in between fabric on my cutting table), so I ordered one of the oven liners online. It was $8.95 plus $6 shipping. I don't remember the exact measurements but I can tell you I LOVE IT! It likes 1" being the same size as the acrylic table for my Janome 7700. I made a tiny oval cut for the needle and just taped it with clear mailing tape to the table. When I change the bobbin, I just slide the whole table off. It's easy peasy and just as slick as the original slider and much bigger. Good luck with whatever you decide.
Josi in FL