Any Version 2 mechbox should work for your MP5. The mechboxes with small windows where the spring guide is are for M16/M4 guns, which also use version 2 mechboxes. The windows allow for the one pin take-down function for Armalites. MP5s don't have the one pin take-down feature so their mechboxes don't come with windows. But the mechboxes with windows will still work in your gun; it's just that the windows will serve no purpose in your MP5. So don't let the windows stop you from buying them. Any version 2 mechbox will do.
You can check out the small drop down list of international retailers at the top of this webpage to look for a mechbox if you can't fine one cheap locally. As long as your government allows you to import airsoft accessories, it should get through fine.
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