Many of you might not know this is but Buick used various springs in 86 and early 87's turbo cars on production. My car was an early 85 production Oct. It sat at least an inch lower than later units on the lot. Unfortunitly my car spent alot of time in the shop ie: pwr sterring problems and I got to know the Service and Sales Manager well. One day while I was there ,the Buick service rep was there and the service manger and I went out to show him my car and the first thing he noticed was how my car sat. We measured it and than measured a couple of Gn anf Ttpe's they had on the lot and they were all alittle different but my car sat a good 1" lower than all them. I do know they had all the same part number and the units made in 871/2 used the Monte SS springs because that was the last run of the Gbodies. My stock springs sit underneath a TSM car now. Just thought I would share this info.