Tank
I have a black thirteen gallon tank from a 99 or 2000 Cat and an orange 04 King Cat seat that has been modified to fit. Looks good and fits nice. $100 for both.
I might also have a black 12 gallon tank that would work. You just have to cut the seat base off and it is the same size as the 1M tank. As far as I know no 1Ms came with a black tank, they were clear with a black cover. I also have a couple covers.