Census numbers for Ford LAAT

[Alastair Thomas]

Although I have initiated this question under "New Thread" it is a fairly old chestnut.
Having spent a happy morning using the search facility to try to track down definitive lists of contract numbers and census numbers, and having read many fascinating posts, I am no further forward.
My brothers and I are rebuilding a July 1944 F60S and, having established that the Isle of Man Territorial AA Regiment had such vehicles in the Normandy campaign, we would like to dress the truck as such. The Manx Museum has kindly given us permission to do so but do not have any pictures of the actual vehicles from which we can copy the census number.
Where do I start to find the correct batch of numbers that may apply to this vehicle? Is there no option but to visit the RLC museum at Chillwell?