Slip on? I dunno if that's what I got. But I did get new front seat covers from Jax last year. Hads to take the seats apart, and re-strap the covers underneath the seats with the metal rings, etc. I wouldn't call that slip on, maybe it's something different.
But I'll say this...looks like brand new darned seats. Beautiful material and a great match to the originals. Couldn't have been happier.