AJ and Hank,
Unlike the flat straps that adjust the gauge wheels on on the 46 and 50 inch decks that fit the open frame tractors (318, 322, etc...) improvements were subsequently made. Late model decks such as the really cumbersome 62 inch shaft driven mulching unit on my x495 have ROUND vertical supports for the gauge wheels and a cross drilled hole to use as a side-to-side caster lock for installing/removing the deck from the tractor. This deck had both inch size shafts and later metric hardware available depending on year of manufacture -- don't ask me how I know this...
Note that this large deck had grease fittings on the gauge wheels...!!
The 48 inch REPLACEMENT deck has this style of re-positionable gauge wheel with round post as well...makes sliding it under a tractor a snap.