Not certain about your make & model, but I've replaced speakers on two previous TTs with standard big-box store car door ones. Had to move some insulation a little with one of them and both needed the holes enlarged, but it wasn't difficult at all. Remove the old ones, leaving them still wired, and you should be able to tell.
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'06 F350 Lariat turbo diesel dually, Curt 20k, Softopper, Aerosheld, coolant filter, air bags
'10 3665RE Hickory, wet bolts, Trimetric battery monitor, 4 100w panels & Morningstar TS-45, still tweeking!
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