1) As above mk1 or mk2? 1.4-2.0 I'm sure is the same including diesel. Not sure on the RS or ST170 but reading between the lines I don't think you are buying either of these.

2) See above (adapter)

3) Pics may help

4) Eibachs +1 (I have Apex springs on mine at the rear, still OK)

5) Nope. Fast road discs and pads are the only step ahead before going ST170 or big brake upgrade.

6) See above.