I have been researching for quite some time to find struts to replace my worn ones. My truck has the 6500# GVWR package and letter T springs (rate=633#/inch). Where ever I look the listed replacement struts say not for HD suspension. I want to keep the ride height and feel that I have now. I have inquired to several shock manufacturers and none of them will tell me their spring rates. I realize I will not find the exact rate I have now, but would like to know if theirs are close. Any ideas?