tjk829,
You can buy foot controllers and cord sets from Sew-Classics on line and you might find them at your LSMG. I had to replace the cord set for my wife's 319K and I found them locally.
Just make sure how it's wired, cabinet or portable, so you order the correct version.
Our 319K has a knob under the bed to drop the feed dogs so I'd wager the W model does too.
As for the color I'm thinking some one did a bit of parts mixing. I've never seen a black machine with green parts. Looks good though.
Joe