Not sure of model numbers mate, this is all the McMillan site says about it, and thier description of the custom drop-in option.

"CZ EXPRESS

This is an English safari style stock designed specifically for the CZ 550 Magnum action. It will work with many other large caliber actions with drop belly floorplates such as the Brno 602, the Olympic Arms BBK-01 and the 02 actions. The medium-width forend will accept custom barrel contours up to a Douglas #5 but will not take heavy straight taper target type contours. Right hand only.

CUSTOM DROP-IN (with Decelerator Pad)

(Custom Drop-in is completely finished and includes: full inlet, pad, 2-studs, paint or molded-in camo or marble colors"

I bought this privately from a guy who decided to change a project he had planned to use it for, the stock never had anything mounted in it so is as new.

There is no bedding block, just a recoil lug,

Cheers!