This is a what a complete DK coin mech face plate is supposed to look like:
There's good news and bad news regarding finding the replacement parts.
Asahi Seiko USA still makes most of these replacement parts like the face plate, bolts, push button, spring, etc.
Unfortunately, they started a policy last year where you have to make a $50 minimum purchase in order to setup an account and place your first order. The ironic thing is the coin mech parts are really cheap. So you either have to buy parts in bulk or invest in replacement coin mechs as well which run around $40 each I think.
Here is my post last year about getting my replacement parts:
http://forums.arcade-museum.com/showthread.php?t=98976
Like I said in that post, they no longer carry the original small coin return cups. They only had those bugles (loops). I could be wrong as I haven't ordered from them in a while. Your best bet would be to post in the WTB section of KLOV. I'm sure there are guys that have extras laying around.
The 25c decal is made by Rick from ThisOldGame.com as part of his Nintendo coin decal set. The only guy who makes them for the actual faceplates and the best quality IMO.
I hope this helps.