Buying advice

I'm going to look at a 2005 seat ibiza cupra tdi pd160 I know it's not a skoda but shares slot from what I understand with the fabia vrs

After abit of advice on what to look for

Where the vin numbers are??

And He sent me this anything to worry about what could it be if it's not wheel balance

I thought one of the shocks was on the way out as was getting a bit of vibration in the wheel. So when I booked it in to get the clutch and flywheel done they road tested the car after fitting the new parts, and said to get the wheel balancing checked. They re-balanced and was fine for a while after that, doesn't violently snatch left or right or anything like that. Car is perfectly drivable (recently done a 180 round trip to Leeds and back!)