Usually they come with badges, but if there aren't any (de-badged) you can probably tell by getting a build sheet using the VIN:
Want a build sheet for your MK? Trying to figure out which options you have, like FDI or FDII? Looking to buy and need to confirm options, like which transmission? All you need is the VIN! Copy and paste the link below (minus quotes) into your browser , then replace the xxxx.... with your 17...