The K40 would be the best choice, IMO except it is a trunk mount, and looks pretty rough, I would give EVERYTHING a good cleaning, and even some de-oxit spray for the controls in the radio. The lil wil aren't bad, but nothing great at all. K40 is my first choice. But who knows, clean it all up, test it out. For 30.00 you might have a good little mobile portable set up after putting a little effort which costs nothing but time into it.
ONE MORE THING! I JUST LOOKED AT THE MIC IN THE PIC. This is *important*! A lot of people don't know that the 510 and 510 radios use an electret condensor mic. This is important because if you put a common, typical dynamic mic on it, it can hurt the element because of the voltage on the audio pin, and will ALWAYS sound horrible, low, muffled audio. The worst is when someone tries to wire up a noise canceling mic like a 636L or RK56 to one of these. SO make sure that mic pictured is NOT a dynamic and is an electret one. If not, you will need either an original electret mic for it, or an amplified mic for it to sound right on transmit.