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So despite the fact that you still didn't tell us what you want them for, you answered your own question anyway. Ok...
Mainly termies and tanks (raiders land raider etc)
Oh ya durr. Neodymium Magnets 1/8 x 1/16 Disk N42 Rare Earth. I already have some of the same size though got them in two batches and wasnt informed of the strength on them (came in a lot with auctions) and though the same size one is definitely stronger than the other (one is fine with 1 magnet and a piece of metal where the other needs a magnet on both pieces.) they both work fine.
The difference between the n45 magnets I commonly use for magnetising spare arms and the n42 magnets you've bought will be negligible.