The stock ones are 5.25" single components. You can fit most 6.5" speakers into the bracket without any major modifications, but the issue can be the depth of the magnet. I recommend taking one or both speakers out (insulate the loose connectors) and take one of the plastic brackets out that they sit in. Then you can take the plastic bracket into the shop and find something that fits inside it. If the magnet is too deep it might hit the window when you wind it down.