Tough to tell, but you might need the vend motor as well, it would be at the bottom left next to the evaporator.
It appears missing as does the selector linkage.
Hate to rub it in Krovel, but yes, considering the missing parts, you did overpay!
On the bright side though, everyone here has overpaid for a machine (or two). Now that you have found this site though, hopefully it won't happen again. Just ask away about machines before you buy! Be careful not to divulge too much info on it as lurkers here might nab it from under your feet.