I just ordered a 5 shot clip for my 243 Tikka T3. It was not cheap, it cost me about $65.00 . I am going to pick it up later this week. That is a lot of money for a plastic piece. I ordered it from DK Mags, Phone 763-442-6541 USA, I talked with the people that work there and they do not usually stock Tikka parts but they can special order almost any mag that you can possible order, I hope that this helps.
Doug Olwin