I can't comment on fitment I'm afraid. Try looking here
http://www.oemepc.com and going through a few variants to see if the part numbers match for subframes and seats. If they match then it's the same part used on both and therefore you will know they fit.
Corrado seats are by far the best in my opinion. They have a lower subframe and sit about 2-3cm lower. I'm the same height and find standard polo seats to be too high on the lowest setting with a sunroof. Not so bad without a sunroof (bearable).
If you ever spot something in the UK and need to get it sent over I'm happy to help out. Don't mind helping a fellow G40 enthusiast! I've seen plenty of things abroad in the past and wished I had a contact there to make things easier.
I am also (casually, ie when I remember) looking for Corrado seats.
Another option you have is to buy a new bolster or another seat with good bolsters, unstitch it and fit the new bolster then restitch it / fit new material. I've yet to do it but intend on doing so when I fit my £30 heated seat kit from ebay!
(got an OEM 5 setting VW switch so it looks factory
)