KeyStep 37 - what is the full height?

[sa11e]

Hi,

Wherever I look the KeyStep 37 size is said to be 550 x 147 x 35 mm. But clearly the height including the knobs is much over 35 mm.
Can someone tell me the full height?
I need to know how to adapt the height of my pull-out tray under my desk - where I plan to have the KeyStep 37 I am about to order.

Thanks!

[Disto]

It's seems to be ~5.5cm (with the bottom pads and knobs)

[sa11e]

Thanks a lot!