that i didn't know.. 085 boxes are notoriously pap.
I was not delighted to find this in a scrapyard which only had Polo saloons and Caddy vans in it a while back.

Plus the ratios out of a petrol 085 gearbox are TOTALLY inappropriate for an SDI.

The casting also needs bits hacked off it to fit and (obviously) the bellhousing is different.
Oh and doing anything on a 1.9D motor in a Polo engine bay is a tw*t.