Yesterday I put different struts and springs in my 02 Subaru. They came off a 99 outback but the struts aren't stock, they're aftermarket KYB and surprisingly lowered my car a solid 2-3". The problem I have it the rear end is saggy and I know I need saggy butt spacers but I'm not sure what size or what to look for. I was told to purchase 3/8" saggy butt spacers, is that what I should be purchasing??