I have both for sale after selling the .308,
The Muzzle Brake is the one that fits on the Tikka T3 Tactical/Sako TRG, it's brand new, never had a shot through it.
http://www.faanderson.co.uk/Rifles/Tikka.html (Bottom picture)
New Price £155, I'd take £100
The Wildcat bush is for a M18x1 thread.
Pics on request.
Bush =£35 plus Postage