AS91524 - FT Aluminum Arm Mount (D) needs inserts to match AS91389 - Arm Mount Inserts (D)
In my experience it doesn't take all the play out as I still had to shim my B5M to remove most of the play, I think it was 0.3mm shims each side of the wishbone. The B5r has less play on the rear arms.
Adding the optional 3x8mm grub screws will remove a lot of play from the rear hubs and castor blocks/steering arms. The hard parts have a lot less play than the stock plastic parts at least on the front but not tried them on the rear of either car.
From what is being reported in the states the alloy steering is mainly being used to add some weight up front. The alloy rear hub carriers add the option of tuning the ballstud height and are said to be worth getting as most of the US team drivers seem to use them but good luck finding any in stock.
The alloy shock mounts are worth a look as the plastic ones are hollow with a 3mm plain nut to fix the screw to the tower so the screws can bend in an impact.
link for the chassis protectors on here
http://www.oople.com/forums/showthread.php?t=146836