Hu Can u use a sierra adjustable steering column on a Mk Indy without modifying any brackets etc ?

Yes

Are you using a paddle shift? If so and it's a rod operated one you'll need to lock out the adjustabe length (height is OK). If it's a cable shift then the outer cable achorage has to be on the column or the same applies.

cheers for that am going to be using a paddle shift with rods so i will lock out the adjustablity once am happy with the setting