Hi Johnny,
I have a glass rear window and its rubber in stock, which cost £50 and £9.50 respectively.
The last time I got a quote for making a perspex rear window it was more expensive than the glass one, which seems crazy to me so I didn't bother re-stocking.
The glass window is harder to fit, but once in you don't have to worry about it yellowing or scratching easily.
The only problem with glass is that no carrier will offer insurance to ship it, but if you are coming to Stoneleigh then I would be happy to bring the parts along.
Regards,
Alistair Courtney,
Alternative Cars Ltd,
sales@midascars.co.uk