Don't know if anyone else can tell, but I actually just shoved lego tires onto a grey circular piece for the back wheels. I didn't have any good sized rims that paired with good tires for the back wheels so I forced a small thick tire onto some type of grey circular piece I got from a Star Wars kit. For the front wheels I actually used a pair of tires I just found in my house. I don't know what they go to or if they are even Legos, but they work just fine for the front.
Custom "DMC" sticker.
Custom "OUTATIME" license plate.
The back isn't 100% accurate to the movie. I couldn't fit all the hundreds of wires, buttons, and gizmos on the back so I just put wires and detail until it looked close enough and pretty awesome. I had to use tweezers to construct the back because of all the fine intricate detail used.