I'd be a bit surprised if this was the actual clone recipe. My guess is the ratio would favor a majority of munich as basemalt, not pils. Celebrator is rather dark but that may be a touch too much carafa special.
Converting to extract may be a bit more challenging. The key is going to find Munich extract. Once upon a time one of the big online retailers (either MoreBeer or NorthernBrewer) was carrying Munich extract - and if you can find that, then converting to extract will be pretty easy.
I would simply either follow the ratios Munich to Extra Pale (use DME for the extra pale) or do a mini mash of Munich malt (but throw a half pound of pils in there as well, for the enymes).