Would any one know what rear hydro helper springs for a 72 gt were fitted as i have green stripe ones and orange ones and they are 2 different lengths.

Orange - AYG7060

21A1806

Isn't the number 21A1806?

AYG7060 is the Australian made orange spring number.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Its a UK Military codified part...

National Stock Number (NSN)
Description
2510-99-809-7086, 2510998097086
spring assembly, helical
P/N 21A1806
Federal Supply Classification
FSC 2510 - Vehicular Cab, Body, and Frame Structural Components
National Item Identification Number
NIIN 998097086
Codification Country
United Kingdom

So possibly, as used on a UK Moke/Mini...

PS C.O.D. Old Dalby, Melton Mowbray, Leicestershire. During World War II, Old Dalby served as an ordnance and army vehicle Depot. In 1996, this military base was closed

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"Show me the Mini!"

Thanks Guys. Does any one know what the length of the orange rods should be as i have 2 different lengths.

Do you mean the total length of the spring plus both ends? Or just the eyelet end for the stub axle?
Happen to be cleaning up a pair of these at the moment.
There are 2 different springs: the first were fitted up until some time in early 1966, then replaced by the orange coloured ones used thereafter.
Both springs are meant to be the same overall length of 10.9inches (to centre of eyelet), according to an item in the mk1-forum in UK if you have access:

http://mk1-performance-conversions.co.uk/pdf/hs-c.pdf
Quote from article:
The earlier 1566 spring assembly is described as;
SHORT SPRING, LONG LINK (spring = 6.2”, link = 3”) while the later 1806 spring assembly is described as:
LONG SPRING, SHORT LINK (Spring = 7.8”, link = 1.5”

The diameter of the spring wire is larger in the later types.

I think he is talking about displacer to knuckle joint rod?

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1967 New British Racing Green Mk1 Cooper S, 1967 Lake Green 1275 MG Midget, 1969 Jet Red / Crystal White Mk2 Cooper S, 1972 Gambier Turquoise Clubman GT (ex police), 1972 Camino Gold Clubman GT, 2009 JCW Challenge Edition, Megane RS265, Clio RS220.

My mistake.Yes. All that for nothing! Damn.
Rod length is 247mm

Not at all. The data you posted about the springs is there for future reference.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Completely agree - I certainly learnt something new so thanks!

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1967 New British Racing Green Mk1 Cooper S, 1967 Lake Green 1275 MG Midget, 1969 Jet Red / Crystal White Mk2 Cooper S, 1972 Gambier Turquoise Clubman GT (ex police), 1972 Camino Gold Clubman GT, 2009 JCW Challenge Edition, Megane RS265, Clio RS220.

That is some very good information thank you for that. I have had a few gt over the years some better the others and they all have been different. Some have had green bags, yellow bags green springs, orange springs so its good to know what's should be in it.

Bill B, what are you doing to clean your springs up ?

The pair I am cleaning up now still have a good zinc plating on them so just used a degreaser and wire brush. Others I have washed in a phosphoric acid solution to get dirt and rust off, then had them zinc plated. Doesn't harm the rubber bits inside the spring.