Hi,
I found a seller on eBay offering a very cheap double kin dash kit for a Mazda BK (Gen 1 MPS included) for $12.99 + shipping.
Stereo Radio Install Double Din Dash Kit w/Wire Harness | eBay
It's not a Scosche brand I keep hearing about but "XScorpion" brand which looks exactly the same. It's all plastic (this includes the internal mounts), but a good cheap find!
JB