What rear spacers are people running with keys?
 

I just bought an H2 and it has keys in the front, OEM coils in the rear and 37" Trail Grapplers. I'd like to raise the front up a bit more and add spacers in the rear. Is there a "standard" most people use for spacer height? I'd lik to keep the front/rear sitting level. On ebay, I see spacers from 1"-3".

For those with spacers and keys, post some pics!

Thanks,
Todd