Apparently 115 GTV stock springs sets are no longer available, or are aftermarket sets that are close to original specs. Can a set of 115 Spider springs be used in the GTV? What are the differences and trade-offs? --TIA
The information that I have seen indicates that the front springs are the same and the GTV rear springs are about 10% stiffer than the Spider springs - probably not enough to notice with old springs. So there is a possibility that the spider springs will soften and lower the rear a little.
Frank at IAP said the springs for the spider and the GTV are virtually the same. Alfa made up the differences in ride height with spacers. I have a set of red springs Alfa Spider/GTV Springs and Sway Bars that I bought for my GTV years ago but never installed if anyone is interested.