With but the pathetic experience of owning only one A10, and only having owned one A10, and being in a place/city/country where seeing another A10 at-large might happen every 10 years (if at all, as the only time I've seen another, while living outside Chicago since 1992, was at a vintage British vehicle show), I still have an opinion. And that is, I think the upper hole carries the bumpers when a 2-1/2 gallon tank is fitted, as is the case for my bike. From photos here on the forum, it appears the lower hole is used for the larger 4(+) -gallon tank. Ipso-facto, if I've interpreted it correctly, the bent straps should be for the 2-1/2 gallon and the straight ones for the larger tanks. In my case, as you've seen, no bent strap, instead, straight throught the lower hole.
On another point. I had to shave down the bumpers to get where the tank was a sane fit over them.
Richard L.