I have a pair of Kad discs for sale which are 283mm diameter so standard Gti6 size. However these have a back offset by 10mm so the disc itself runs 10mm closer to the car. Combine this with the spacers that are 10mm which you fit between the brake caliper and the hub eliminates the need for spacers.
I have fitted these discs onto my 205 with Kad 6 pots and C5 steel wheels clear with no spacers.
Discs are grooved and there is no wear lip.
so what you get is
4x longer caliper bolts
4x 10mm spacers to move the caliper inwards
2x Kad 283mm discs with 10mm back offset.
fitted onto my 205.
two of the caliper spacers and two of the caliper bolts.
comparing discs... The far one is the disc with back offset and the close one is a brand new 306 gti6 standard disc
£90 delivered
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230 hp 2.1 16v XU 205 rallye on jenveys Project thread here309 3dr K20 Type R