I removed the dash yesterday, eager to install the 3 1/2 infinity's I bought. What I found is interesting. There were no 3 1/2's already there. The spots on each end of the dash which look like they might hold a 3 1/2 don't have holes which line up. The only speaker in this truck appears to be something like a 4x10 in the middle of the dash. Anybody else have this setup stock? I'd like to use the 3.5's, but is there a change in my dash where brackets are needed for mounting?