This might help. I am sure it list all the chassis in the back, and whilst it wont give a history of what happened to each car subsequently, it should be a very good starter for 10
https://www.amazon.co.uk/Brabham-Ral.../dp/1855209233
Ralt spares are often available on the second hand market in the UK; people like Dermot Healy can often help. Also, members of the Monoposto Racing Club may be able to help as Ralts were popular in that club series for many years. Dermot's contact details are on there, too.
http://www.monoposto.co.uk/