Mike, the only thing that it looks like you're missing on that 450 is the plastic face plate and some bulbs. The metal casting is a little more difficult to get, but both of yours are there. Now if you want to get fancy, the bridge can actually have up to four heads. Two upper and two lower.
There are plenty of parts dealers out there. If Rob likes that one, go for it. I haven't done postwar in years, I've fallen out of the loop.