@toroloco, yes for the center springs as they are for the most part common in size and length so that makes it somewhat easy to compare them. Side springs are another deal altogether as each company has their own style and type. That's what would make it very hard to come up with a chart for all of them to compare to each other. I use speedmerchant and crc springs in my car and go by wire diameter. While not the answer your looking for its something that I've never needed to compare between all the available springs. HTH, Chris