Each car has a chase version. Go to southtexasdiecast.com and scroll down to the Classics Series 5 link. They don't have the chases listed. That might happen later, when the admin guys get access to the actual car or confirmed pics and info.
Also, according to HWC, there will be a box set including all the chase vehicles released to Wal-Mart sometime soon. I think it will be similar to those Top 40 sets from a couple of years ago, or even the Treasure Hunt box sets that J.C. Penney used to sell. Seeing as I have never actually seen the Top 40 sets in a Wal-Mart, or even the Treasure Hunts sets at Penney's, I expect this set will be pretty darn hard to come across, so if it's something you are interested in I suggest you keep your eyes peeled.
An update. I was just talking to my brother and apparently a chase version of the SF black Greased Gremlin hasn't been found. Frankly, I believe any chases that were supposed to be produced at the time Classics 5 distribution has slowed to a crawl probably weren't made. The second recolors had been produced by the time distribution began picking up.