Hi. So would 1.9 or t-jet have stiffer anti roll bars that would bolt on to my 1.3 2007 GP? I already have TA-Technix springs and shocks but after Bluespark chip and up coming bushing repair some stifness would be nice!

Yes - ish. The grande punto doesn't really have a rear anti-roll bar as such since it is a twist beam. The 1.9 mjet and t-jet do have stiffer twist beams but you'll have to swap the whole axle assembly.

Front should be straight forward.

Oh sorry. Yes I was talking about the front anti roll bar. The rear feels good after -30mm drop. Any Idea if I have 18,19or 20mm in the front and from which model should I be looking a thicker one?so do they just bolt on even if they are thicker? any shops where I could order one to Finland? Thanks!