i have a turbosmart 38 ultra gate external wastegate and it came with a 14 psi spring.

so i would like to change it with a 7psi spring. i have look on ebay for turbosmart spring but nothing.

so my question is can i just buy any 38mm wastegate spring and fit it in?, because most of those ones on ebay are universal.

my waste gate has a inner spring and outer spring.