The migraine caused me to load up on so many painkillers and caffeine that I cannot sleep. So, of course, I watched the ep again, and read many reaction posts, and I have this to say...
Being that War rode a cherry red Mustang instead of a red horse, many have speculated other classic cars for the other Horsemen. I'm laying my bets right now on Death's Pale Horse being a beige Ford Pinto. Think about it. :D
In other thoughts of what the Horsemen will be driving, I could only come up with the Ford Bronco and the Dodge Colt, or else they could just all have different colored/yeared Mustangs (but that latter would be lame).