Been speaking to my engine builder who i brought this topic up with...
Now they say that they are marked up(paint colour coding) as Skyline spec springs...
When ordering this setup from Japan my Springs were on special order... took a month to make... Going by the paint coding they are not the usual GTiR Springs... Looks like they are spec'd to 12.5mm lift and 10,000rpm... Been checked and they fit fine...
This would explain why they took a month to get my springs sorted... Special build springs...??
They are testing them anyway just to make sure i don't get spring bind...
Will keep posted...
Rishi