Yes, it is all a bit weird. Make sure you find the ENGLISH instructions. Not sure about you but my Cyrillic is a bit rusty.
The strap is well out of adjustment for me, so I will be getting a band de-pinner and other tools.
I noticed that an eBay seller of them has a pack of 5 leather straps for them, made for the Komandirskie range. They do fit the Amphibia perfectly as they are the same lug width. Cost is ~$30 Yank dollars delivered. Might be worth getting a pack of them.
I have purchased a selection of 5 Nato's from
here mainly because they are cheap as chips but the quality of them might be utter crap. And I also grabbed
this one which I think will be useful too. Not expensive at all - about $28 delivered for the lot.