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Pretty sure I've got an alpine mono amp I intended for the mustang but never used. I'll check shortly.
***Update
Yup- still have. It's an Alpine MRP-450. Only 200w though, not powerful enough for your setup. Only intended to power a 8" sub which would have been plenty for the Mustang.
Not to distract but you ever add an amp /sub to the truck?
If it's a good amp you only need a couple hundred watts to push a sub hard pending you have the right ohm set up to load down the amp right, I push a 10 in my boat with 200watts from a jl audio amp and it shakes screws out of the dash
I have a 4 channel you can run as a 1 channel if you wanted. $60 if you want it. Worked perfect last time I used it ~6 months ago, has a few scratches on the outside.
https://www.amazon.com/dp/B002ISXGRG/?tag=tcg21-20