bolt on brake upgrade question st185/levin ae111

[glanzav.tee]

I'm wondering a lot of people have done st185 conversions using the single pot calipers with carriers some have gone for the astra 1.7 cdti disc. but i have a question for those who have done the conversions, which is better single pot or twin pot, if thats the choice also if you opted for a disc which one would it be:

astra disc http://cgi.ebay.co.uk/OMP-280mm-Front-Brak...=item519654b9af

Part Number: TFS/2145Diametro esterno (A) (mm): 280

Spessore disco ( (mm): 25

Altezza totale © (mm): 42

Posizione disco: Anteriori

Numero fori: 5

corolla d4d http://cgi.ebay.co.uk/Corolla-Verso-2-0-D4...=item19b9063ee1DescriptionFRONT BRAKE DISCS , DIAMETER 275 mmTHICKNESS25 MMHEIGHT49.2 MMSolid/VentedVENTEDCENTER DIAMETER MIN THICKNESS23 MM

levin discs http://cgi.ebay.co.uk/TOYOTA-Corolla-Levin...=item4150db40a8

Type / DiameterVENTED / 258mmThickness / Height22mm / 48mmStud Pattern + Holes4

(please not links are just for dimension sizes that are written)

now for the question im trying to ask is there a way of doing a twin pot conversion using any of the above disc's which wont need spacers ?

as for the st185 you dont need spacers all you do is use the astra 1.7 cdti discs which has been tryed and tested all you need to do is get a spigot ring made to reduce the center bore of the vauxhall disc from 60mm to 54mm and it all bolts on.

(this image and the information provided belongs to pocketrocketgtti from tggt)