You have to be a'd about the tyres. The rolling radius is too large on mk2 tyres to fit a mk1. At the very least, your speedo will be wrong (and the wrong side of wrong at that). Your car will sit too high and there is a chance of clearance issues.
Also, be a little careful with a bonnet badge. If the colours on your car don't look right, you end up making it look like a little mouse car.