what kind of amp are you looking for? i have an xtant a4004 and a ppi pc2350. the ppi is probably out of the question though, as i would not do a straight up trade for it.
the sad thing is i just sold that exact amp(not yours) about 6 months ago. now i have an s-10 and that would be perfect for my comps in the front of the truck.
i can measure the mtx but iirc, its somthing like 12"x12".
thats the only pic i have of it now but can got more if you like.