the red car has the extra trim piece on the front bumper, adds about an inch... the rear is just painted to match the front (but is same size). Try alex poulter (33bits) for the side trims
S2 cars have the bumpers overhanging a little more front and back, just slide them out a little on the mountings.
Orange and clear front indicators are the same fitment, amber ones are available on ebay for £1.99... S1 rear light units are different to S2 tho, and have different connectors. I might be wrong but i think clear rear indicators were ony on S2.
I might have a pair of S1 rear lights (amber)... will have a rummage later. think I've got an S1cloverleaf grille too if you're interested?