Front drum HELP!!

hey fabo, i have a 73 duster with a 73 scamp k member when i put it on i found i now had 10 in 5x4in pattern instead of the 9 5x4. my question is does anyone know where i can order that specific drum, what other drum i can use (makes/models/years) and/or can it be possible to order 10 in 5x4.5 pattern drums and put them in with no modifications? just as is, since the studs only bolt on to the drum and nothing else? i am aware ill need 4.5 pattern rims. please help and thanx a lot.
-kevin