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I was curious about the spacers as well when I was shopping for my Tikka. I never did find any or see them anywhere. What I can say is that I changed the stock butt pad for a sims and that added a nice amount of LOP pull for me. It was a win win kind of deal for me. A little longer LOP fit me better and the improvement of the recoil pad over factory is quite substantial.
I tried to find them too but couldn't, so I just ended up going to a plastics store and buying some small pieces of 1/2" sheet plastic and shaping my own, had to buy longer screws too. As mentioned the upgraded recail pad helps too