I am trying to keep my 85 GT convert as original as possible and while I am keeping my original stock head unit, the speakers had to be replaced. I spoke to Crutchfield and according to them there is nothing available that will fit under the dash. I did take a chance and ordered a pair of 3.5" Polk Audio and while they did fit...it made the drivers side speaker cutout bulge a bit and I was concerned it would eventually cause a problem with my dash top.
So...I did some research on measurements and purchased a pair of Pioneer TS-A878 3.5" and they fit perfectly. So if anyone needs front speakers for under the dash, go with the Pioneer TS-A878 3.5" and you will get a perfect fit without any modifications. I paid $41.50 for them on ebay including shipping.
Any questions let me know.
Rob
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