I ordered my springs from Jegs. QA1 10" 250 in/lb springs.
Here is a link to a 10" 275lb QA1 spring. To find different spring rates just change the last 3 digits of the part number.http://www.jegs.com/i/QA1/122/10-275/10002/-1
I also ordered Coleman Racing adjustable sleeves from Jegs. It was cheaper to order them from Jegs than from Coleman due to free shipping from Jegs.http://www.jegs.com/i/Colem...193/420-701/10002/-1
This was all used in the rear of an '86 with new KYB struts.
Edit to add: this is about as cheap as I was able to get by for these. The ones I found on eBay were too skeptical for me to order because they all seemed to use the same generic pictures and had minimal dimensional info. It just wasn't worth the risk to me so I went with what I knew would work.
[This message has been edited by Silicoan86 (edited 07-29-2013).]