Originally Posted by Lotz-A-Landies
				
			
			JD was correct the above information is not accurate, there are lots of different Series rims and some are UK manufactured and others Australian manufactured although often with the same part number.
However one question that has to be considered is that none of the series and early defender rims are designed for tubeless tyres.  The ones for tubless tyres have a ridge running circumfrentially around the rim just inside where the bead sits.  If you dont have the safety rims you should run tubes.
Now back the the Series rims.  (The part number is usually stamped on flat between the wheel studs) 
* the 1948 rims are 4 1/2" wide, no branding on the flats & valve stem hole in the slot.
* 231601 - 5" wide, '49 - series 3 88" rims 49-53 UK manuf. only 53 on UK & Aust manuf.
* 272309 - 5 1/2" wide, 28/16" offset, '58 - series 3 109" rims, 7.50 tyres, UK or Aust manuf.
* 569690 - 5 1/2" wide, 21/16" offset, series 2a - series 3 109" rims UK manuf. only, 7.50 tyres (often called English rims)
* 526753 - 15" rim for 8.20 - 9.00 tyres UK manuf. US market.
* 543384 - 6 1/2" wide, no offset UK manuf. SIIA Forward Control 9.00 tyres
* 569204 - 6 1/2" wide, 13/16 offset UK Manuf. One Ton Land Rover 9.00tyres
* 569203 - 6 1/2" wide, aprox 3/4" offset UK manuf. SIIB Forward Control 9.00 tyres
* NRC7578PM - 5 1/2" wide, Unknown offset, series 3/stage 1/County, UK and Aust Manuf. 7.50 tyres
Only the very late series 3/Stage 1 rims (AYG-8108) had the raised ring between the studs.  Whether it was 6.0" I am unaware.
Hope this helps :) 
Diana