And I'm back, thank you all for saving me a lot of money and irritation, here is what happened:

Me: Hi, could I look at that a15 again?
Him: Look! Do you want it or not?
Me: ... well I need to make sure that it is the engine I thought it was
Him: What engine are you after?
Me: An a15, the 1.5 litre
Him: Yeah yeah, that's an a15! I told you that before
Me: Are you sure it is not a J15?
Him: Look, that engine is identical to an a15 only it has a cast iron head so it is stronger than the alloy ones, all utes came with them
Me: ... soooooo, it's not actually an a15 then?
Him: it is identical! It has the better head on it!
Me: I don't think it's quite what I'm looking for, thanks though
Him: Fark me dead! Everyone wants something for farkin' nothing don't they!

he then started ranting about how someone wanted the tray but did not want to pay for it and blah blah blah and I walked off.

So thank you everyone for saving me from a scumbag who would have tricked me into parting with my hard earned.