just incase anyones interested , 4a-ge springs fit ,same as 7mgte do
Supertech part number .. SPRK-TC25S they seem pretty popular in the US , chepest I saw was $7.10 per spring ..
Brian Crower is doing a kit for the 4e , http://www.raceeng.com/p-18161-brian-crower-springretainer-kit4e-fte-set-4e-fte-kit.aspx