Would be difficult to source locally. There might be a game specific part number to do a search on. I ended up buying my own rivet press, a strip of blue metal and rivets. There were sourced from wwww.pinrestore.com. I know that does not help - but that's what I ended up "having to do". Hopefully someone local to you has a similar setup to create the ramp flap, and press the rivets.
