I would think a 180/55 will work, but you may or may not have some clearance issues with the rear hugger depending on tire manufacturer. A 170 and a 180 will normally fit a 5.5 rear rim.
While the ID of the headers may be the same between 900 and 1000 engines, note that the headers on the 1000DS are different to accomodate the heads on the 1000 engine which were re-designed from the 900. So, I doubt the hearders would be a simple bolt on.
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