What year parts will fit a 1978 cobra mustang?

there is no parts available for this year mustang unless you go to a specialty store, which i havent been able to find.
i need new upholstery and seat foam for the front seats.
it is black vinyl i believe,if that helps.
is it just easier to put in new seats? i really dont want to have to deal with the trouble of doing that but if so what are the best ones to get?
id like to get original looking ones, so where can i find them?

http://www.cjponyparts.com/upholstery-components/c/10110310/action/showall/

thats where ive found upholstery but as u can tell it only goes up to year 1973.

it needs new brakes so where would i get those?
and with the radio, i really want a classic one but if i cant find one, what modern ones would fit?

these are the experts…

http://autos.groups.yahoo.com/group/MustangIIMA