Otherthan finding a good used one of ebay or the wreckers, some auto parts stores have a section filled with generic do-dads and do-hickees that will fit ANY car. I've seen basic 70s style door handles and window cranks you mention. These parts are all made in China so dont expect a picture perfect restoration by using them. Unless you drive an early mustang or chevy, parts like these arent usually reproduced. Its getting hard enough to find vital parts as it is.
BTW the question is more than enough slant related for this board, more than some
everything from tires to dipsticks is fair game around here