Your more likely to find a good 520 metal dash top than to find a good 521 dash top, start searching for a 520 dash top, and expect to pay at least $150.00 or more for it.
You also might be able to strip the top you have down to metal, they look alright that way, but before doing that look at the bottom/underside of the dash top, some have triangular holes in them, they cannot be stripped as then you would just have big holes.
You could also just cover your dash like my 521 had when I first bought it, it had tuck and roll.
