Thank you, Thank you
I have been looking for these ones for a long time. They are the same as the one Rusty has where the tire rolls into the chock and the bottom has fingers that are self-adjusting.
However they are not drilled for attaching to the floor. They are more a mobile stand but I would think you could drill them and blot them to a floor if you wanted to do that.
I just bought two and there are now eight plus the floor model left. They were 49.99 before taxes. It is also a style that you could fabricate a narrower or wider stop (top metal piece) that the tire butts up against.
Shep