The cable connections on the MkII sled is offset to the left (as you view the dash) and doesn't 'build' as much as on the MkI.

In my Polo there's a bit with a hole (for the rubber bumper that seems common today (can screw in to the threaded hole in the sled)) at the center of the DIN slot,
sits 1-2cm infront of rear of the space. I had to really lean on my MkI sled to get it in there (the plastic with the hole flexed back some), but I was seriously contemplation cutting off the extension w/ the hole. Glad I didn't as it secures the rear of the MkII sled perfectly from moving up/down after I added the rubber bumer from another HU.

See attachment. The centre piece with the hole exists for the upper slot too.

/Michael