Don't forget to go armed with some answers to the usual general interest questions like;
Where do you see yourself in X years time? (for f**ks sake don't say "your job" coz they'll think you're an idiot) Mention the sort of responsibilities/skills you'd like to posess.
What interests do you have (other than cars)?
How do you view customer service and what factors are critical in delivering good service? (mention internal and external customers here for a bonus point)!!
Why would you make a good Spare parts person?
etc etc.
They are all old and cliched, but you'd be amazed how often people (esp blokes) don't think about this stuff before an interview, and sit there slack jawed whilst scrambling for an answer.
Also claim to be interested in further study, tafe training courses, computer skills etc. Give examples of the courses you've done and are planning to do. This always looks good in an interview.