John R Spring has always been based in Detroit MI (actually a NE suburb known as Troy). Dunno where their springs are actually made but they've been in business since the 70's or earlier (their website says 35 yrs). They may actually get their springs from Eaton Springs (just a guess/speculation), also based in Det. for many years.

I did a few "Will Call" pick-up runs back around 2002 and they were good folk to deal with..............

http://www.johnrspring.com/index.htm

http://www.eatonsprings.com/

Trivia here.................The name "John R" is the road that their first store was probably located on, hence the name.