Asked Corbin Germany what would be the price for a seat for my GRiSO but re-using a used GRiSO seat I have in my garage.
They answered nicely that this was not possible because they use their own seat design etc. and they have a special offer for me.
699 € (VAT included) + 35€ shipping and 12 weeks delivery
What a bargain
There is also a distributor in the UK but taking into consideration the delivery time vs. the Brexit, I am afraid it won't help