Through my own investigation I turned up this source, but did not order from them. Their site makes them seem reputable. It's not a large amount of money to risk, so someone should give it a shot.
Suits Tikka 15mm dovetails. Includes arrestor pin to suit Tikka T3 and T3x models. Also fits Tikka M55 M65 M590 M595 M695 and M695 Magnum.www.bushwear.co.uk