Below is copied from:
Land Rover, Range Rover chassis numbers
895xxxxxx - 895xxxxxx: Series III 88 inch diesel airportable ('Lightweight' - military export)
901xxxxxx - 905xxxxxx: Series III 88 inch petrol
906xxxxxx - 910xxxxxx: Series III 88 inch diesel
911xxxxxx - 915xxxxxx: Series III 109 inch petrol
916xxxxxx - 920xxxxxx: Series III 109 inch diesel
921xxxxxx - 925xxxxxx: Series III 88 inch petrol station wagon
926xxxxxx - 930xxxxxx: Series III 88 inch diesel station wagon
931xxxxxx - 935xxxxxx: Series III 109 inch petrol station wagon
936xxxxxx - 940xxxxxx: Series III 109 inch diesel station wagon
941xxxxxx - 945xxxxxx: Series III 109 inch petrol 6 cylinder
946xxxxxx - 950xxxxxx: Series III 109 inch petrol 6 cylinder station wagon
951xxxxxx - 955xxxxxx: Series III 88 inch petrol airportable ('Lightweight')
And below is copied from:
Land Rover FAQ - History, Production, Sales - Chassis Numbering
CHASSIS NUMBERING
Where is Your Chassis/Serial Number?
80 inch models:
The chassis number can be found on the nearside engine mounting and on the brass plate on the nearside of the bulkhead. Later vehicles had the plate positioned inside the cab.
86 & 107 models:
The chassis number can be found on the bulkhead inside the vehicle and on the right hand front spring hanger. Note: We've gotten a report of an 86" with the chassis number on the left hand *rear* spring hanger and nothing on the RH Front. So check both places.
88 & 109 models:
The chassis number can be found on the bulkhead inside the vehicle and on the right hand front spring hanger.
Series III 109" V8 (Stage I)
The chassis number can be found on the firewall in the engine bay and on the right hand front spring hanger. (Though Daryl Webb claims "LHR" whatever that means)
90, 110, 130 & Defenders:
Found in the behind Rover's left front corner of the windshield
Stamped on plate Riveted to the top of the brake pedal box in the engine compartment
Stamped on the right-hand side of the chassis forward the spring mounting turret
Range Rovers:
Found in the behind Rover's left front corner of the windshield
Stamped on the right hand side chassis member forward of the front spring mounting turret
Discoveries:
Found in the behind Rover's left front corner of the windshield
Stamped on the right hand side chassis member forward of the front spring mounting turret