Need Parts for a Old Low back Villeroy & Bock about 30 years old?

Hello, I am looking for some parts for a Villeroy & Brock toilet I have had for 30 years. I don’t think they even make the model anymore. I purchased it at the international Bath outlet in Cincinnati Ohio in the US. The toilet is a one Piece low back grey toilet and I need the hardware for the toilet seat. I need all the parts, that fastens the seat to the top cover and the part that fasten the seat to the toilet bowl. Is there a place where I can order on line that shows a photo of the type of toilet I have or do you know of a place close to my area that sales the parts. Thank you very much for you help & support. I truly hope you can help.