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I've just done a Google search on '1991 Warrior motorhome' and found this .It looks like the Warrior was built on Winnebago and Toyota base vehicles. We do know that Mercedes van conversions are used by Winnebago's now and this could be the same for the early 90's (although we can't guarantee this). 

You could try the same question on www.wildcamping.co.uk

A number of them have older vehicles or know someone who has. Sure they will point you in the right direction.

Try a search for Mercedes Benz  410D. You will find all sorts of info. The rest is just a box on the back. All Warrior did was buy a basic cab from Mercedes and add their own bits. You will find most Motorhomes of that date will share many of the same parts. It's the same today. Fridges made by a couple of manufacturers appear in all the Motor Homes. Not many parts custom made. It's to expensive

Hi,

Another place to try is the Classic Campers Club. 

Their membership is open to anyone with a 'van older than 21 years, so it's a good bet someone will have an idea where you should look for information, parts, etc.

Enjoy!

http://www.classiccamperclub.co.uk/about.html