Dan parts out bikes for a living, so my bet is this one is not off his bike (the biggest clue is the red background he uses for his soon to be ebay'd pics of parts)

That should answer #1

#2 and #3 I can't guess at, but he doesn't sell anything that is junk.. Only good stuff.

 

1. Moving back to the RC51 front end, thanks Yamadog!
2. Installation is extremely easy and straight forward... it simply clamps onto the forks legs.
3. I've owned it for 3 or 4 months

4.... thanks Lazn!