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However I have read there are slight differences between the Belgium and Japanese pre81 mags and that one will not fit the other without a little tweek. This is not personally confirmed.

Made in Belgium or Japan? Has from what I have read yours is right on the change.

Yes that is the one. Pretty easy to see which is the spare.

My understanding is that is a pretty fair price depending on condition. Good ones can go for a lot more, if you can find one.

Those extended Mags are worth half the price of your gun. If you want a flush fit sell the whole rig and buy the 7mm08 advertised on here.

have you managed to find a spare? If it does not work out you might be stuck with a single shot.