Try Steve Fagioli at FTE Engineering down Wickford Essex....
he deals with Rubicon Express and having had their 2.5" lift and the 4.5" lift can say they are good as leaves go .......
RE also do a 1.5" lift that is meant for SOA as the eyes are reversed but people use it as a spring under to get the 1.5" lift....... Low is good mantra at the moment

Or get YJ springs from USA automotive standard size..... Chances are you will get an inch or so lift as the CJ5 is relatively light in weight.
Not sure about spring length but with welding and or outboarding shackles front and rear most things are achievable.