even if you hate E-bay -- get one off of there -- that's your best bet. I got one for my wife's Z570 a couple of weeks ago, it was off a 1999 or 2000 Thundercat and I paid $2.00 plus $8.00 shipping.
All you need to do is get the part number off of the listing or check on Brown's for what it will be and search the Brown's site for it's description. You need a "12 Pulse" - sometimes abbreviated 12P.
the part number for the sled should be 0620-277, but I think the one i got for the wife's was a 0620-237
there's one on e-bay right now off a 2002 ZR600 EFI for $19.99