Don't need one , ......you can make them at home just using hand tools :
http://www.tackleunderground.com/community/gallery/image/2487-crawler/
http://www.mooreslures.com/ carries those wings as well , ......check out PDF page 32 of the downloadable catalog , ........though I don't know , how much a "Crazy Crawler" is over there in the US , ......but these store-bought creeper wings make up for muskie and pike lures , ......a "Crazy Crawler" may be a bit undersized in this case , I guess ?
@ Nathan
I have some written Creeper building instructions somewhere(in English) , also explaining how to make the wings(with soldered on metal tubes as hinges) and details about their correct assembly and tuning .
Unfortunately I'm unable to publish these as I've promised not to do(don't have a scanner , anyway , need to shoot pictures) , .......but PM's are not public , are they ?
One thing's for sure , ...the lure blanks have to be made of very buoyant timber , yet strong enough to keep the mounting screws(hookhangers should be thru-wired for muskie) , minimum 4 1/2" to 5" length and mnimum 1 1/4" thickest dia to be able to carry those heavy wings plus other hardware(maybe even also hookspreaders) and still retain their intended action .
Greetz , Dieter