Brake shoe issues on 1964 C10 280 v 228 shoes

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Ok, so I decided to go through all the drum brakes on my '64 C10 because I was getting some squeeling. I have run into several issues one of which is the shoes. So I will start with that issue.

1. All parts suppliers seem to say that the #280 shoes are to be used on the front and rear with the 7018 hardware kit to be used on the rear and the 7017 hardware kit to be used on the front. Upon disassembling my old brakes, I found the hole for the rear shoe retainer to be snug with the retainer cup. However, when I tried to assemble them with the #280 shoes, the hole for the retainer cup was significantly larger and did not fit snug. To me the snug fit makes sense because it acts as a pivot point for the rear shoe lever assembly. I had a set of #228 shoes and the retainer fit snug like the set of shoes that was in it before and it seemed happy. So which is it, the #280 like they all say, or #228 shoes that fit like the last ones that were on it? Is the significant difference in size between the retainer cup and hole in the shoe a big deal? I would think that it was cause a lot of excess movement....

2. My stock backing plates have no adjustment holes in them. The adjustment holes were actually in the drums themselves. The new drums have no adjustment slots. Has anybody run into this issue? I am considering drilling the backing plates or the drums. Likely the backing plates so the drum balance isn't thrown off. Is this what others are doing?

3. My front hubs are riveted to my front drums. The drums are wasted. I was just planning on separating the two and stick the hub back on without attaching it to the new drum and just slip the drum over it like the rears. Is there any issue with this. Why would the hubs have been riveted to the drums in the first place? Seems pointless.

Last but not least.... Is it possible that a previous owner swapped these brakes to full-size car brakes at some time? The #228 shoes that fit so well came from the full-size GM cars of the same era. Any way to tell if this is the case for sure?

I'm just a bit hesitant to move forward with the #280 shoes after seeing what was in it before. At this point it's hard to tell which is the correct shoe, or if it even matters.

Any info would be appreciated. Thanks.