There's a new one on Ebay NOS , https://www.ebay.co.uk/itm/276129977476 starting price £150 though should go for serious money . You can replace the vinyl sunroof yourself for about £150 and a lot depends on the condition of the metal headers as they tend to rust. Adding a headlining is about £30 for the material. To get somebody to do it professionally is close to £1,000 nowadays. I did my Vitesse together with a new headlining . If you want to DIY i can let you have some suppliers and Uncle Pete may still have some NOS headlining for sale
Paul