[polaski]

I picked mine up at the local Ace hardware in the nuts and bolts section. They had a ton of stuff on springs, although that may not be universal to all Ace hardwares.

I highly recommend that 5 x 3/8 x 0.047 spring if you can find it.

edit: It might be good for my mileage, my last tank calculated to 36.9 mpg. That was a 2 week tank driving around town and I commute to work everyday. Much better than the 34-35 it's been getting with more 55 mph highway mileage on it. Time will tell.