You can find some of the more generic parts on eBay, however there are a couple of decent stores of used/spare parts online. If you still can’t find what you’re looking for, check out the my Hard to Find Fairway Taxi Parts page which may give you some reference towards vehicles with the smae parts which are still available.
Motaclan – Formerly known as Leacy Classics, this company has recently rebranded. Much of the stock is originally from London Taxi Exports.
You will also find plenty of people online who ‘break’ old Fairways for parts. You can find details of regular breakers on the forums, which I’ve listed here. If you’re may be looking for some inspiration, there are some great websites made by other drivers and restorers here.