If you are looking for the thinnest jack pad, get the Murphy's Law (0.948 inches or 24.09 mm).
The Reverse Logic pad that I have is the one with the extension that you can unscrew. It's dimensions are 1.19 inches or 30.25 mm without the extension. With the extension screwed on its 1.783 inches or 45.29 mm. If you remove the rubber pad at the top of the Reverse Logic you can remove 0.083 inches or 2.13 mm from the thickness.
The Street Rays pad is pretty much a clone of the Reverse Logic as far as height, but it has a slightly thicker rubber pad on top. It's 1.225 inches or 31.12 mm thick. If you remove the rubber pad at the top of the Street Rays you can remove 0.120 inches or 3.06 mm from the thickness.
P.S. If you don't have any jack pads yet and will need multiple ones, I recommend getting the Street Rays pads because they are the cheapest and strongest (solid aluminum is more easily trusted if you want a 3rd party tire shop to use them). My only issue was that the supplied O-ring on them is not big enough to hold the pads in place on the car and it's a little more work to hold them in place until the lift/jack starts pushing on them. However, I found the perfect replacement O-rings that will hold the pads in place and let Street Rays know so that hopefully they will update their product. If you buy some of these pads and they still have the old, smaller O-rings you can easily replace them with the ones that I found to work perfectly. The correct O-ring size is 210, which has a 1" OD, 3/4" ID, and 1/8" thickness. You can probably find them at a local hardware store. Or buy online at Amazon for cheap if you buy as an add-on
https://smile.amazon.com/dp/B0051Y2EJK/, or
https://smile.amazon.com/dp/B0051Y1BF8/, or
https://www.mcmaster.com/9464K31
P.P.S. Here's a picture of all the jack pads. From left to right: Street Rays pad, Reverse Logic extension piece, Reverse Logic pad, Murphy's Law pad
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