Interesting mix of questions
English Brochures Yes they do exist for example
http://www.ebay.co.uk/itm/FORD-ESCORT-CABRIOLET-Fleetowner-Product-Guide-Sales-Brochure-1984-/201161888667
The Gas Tank is 12 USG or 48 L metric
Rear Drums are i think for this model year 7"
Wheel Options were limited either 13" with Plastic Wheel Trims or 14" Alloy in a Telephone Dial 4 Hole layout
Wheel Size 6J X 14
Tyre Size 185/60 HR 14
Hope this Helps
Dave