There is a Firestone kit, ask a dealer. I looked into this a yr or two ago.
But Polyairs are the go. I've never had any trouble in 10+ yrs I've had them. Very versatile, easy to adjust. They'd be my suggestion.
Regards
Max P
 
 
		I managed to pick them up from British offroad in Qld some years ago when they were called Landrover Land. They bought several rolled Army perenties and one of them was a Norforce RFSV. The outer coil is the standard perentie one AYG7167 (19.3mm coil thickness and 410mm long) and the inner coil is RRC3266. There is a special retainer that fits into the hole in the chassis spring bracket to locate this spring (RRC3352). I know that WB Statesman V8 front springs are the same as these inners.
There is a Firestone kit, ask a dealer. I looked into this a yr or two ago.
But Polyairs are the go. I've never had any trouble in 10+ yrs I've had them. Very versatile, easy to adjust. They'd be my suggestion.
Regards
Max P
well i was real happy with the polyairs that were fitted to my defender until the other day i discovered one had been holed
i think i brought the defender in 05 and up until the other day i had no problems, i reckon the previous owner install had then install for a number of years, a rough gues would be 8 years
i have standard 110 springs with polyairs fitted, i have been happy with this combination. i toured the simpson desert fully loaded and the rig sat level and rode well, i did have to let a bit of air out when i was in the sand and wombat holes for comfort reasons more than anything. i also tow our caravan a few time a year with a reasonably high tow ball weight
i now have to source some new air bag, the U.S. is loking good, my only concern is warranty

Timbren, Hellwig Helper Springs, Bilstein Shocks, Firestone, Air Spring Kits, Mile Marker Winch
And there's a few pretty long discussions of air bags here
Airbags - Polyair or Firestone?
 YarnMaster
					
					
						YarnMaster
					
					
                                        
					
					
						I have had polyair and firestone for disco I side by side for comparison, and can't see anything that would make one better or more robust than the other.
What is the inside diameter of 110 rear coils? I have some polyairs for 80 series landcruiser and wondering if they might suit (approx 5-1/2" 140mm inside coil and about 9-1/2" 240mm tall (not including blocks)).
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