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I haven't done an 803 in a while, but the last one I did I used a piece of 1/4" thick rigid plastic for the spacer ring. I made it just slightly bigger than the diameter of the float and rather than a circle it was more of an oblong triangle ( helps get it through the opening of the tank easier...

Yup, that should work fine. The sender goes in the tank with the wires pointing to the right ( when looking from the back of the machine, so orient your spacer facing 90* clockwise from the wires. Wires facing East... Spacer facing Due South.

Correct. On an 803 you would use an 8.5" sender ( 8" will also work ) BUT, the float will be very close to the ledge inside the tank and could bind. On 803's I always install as "bumper" to keep the float away from the ledge. At first I used a rubber donut, but soon realized it could degrade...

The 803 tank is much deeper, you actually need an 8 1/2" sender ( 215mm ) so the 200mm is reasonably close, just over 1/2" short, but gets the job done just fine.

Here is one place I have purchased from in the past. https://www.fisheriessupply.com/wema-usa-sss-ssl-flanged-fuel-water-tank-sensor For an 802A you need a 5.5" long sender. Recently I have found them much cheaper on ebay ( $25 ) but the problem is they don't offer a 140mm ( 5 1/2" ) sender...

Yup, it's a hollow brass float. They occasionally get tiny hairline cracks in them and eventually sink. You will have a hard time seeing the crack, but if you clean it with brake cleaner then blow it dry it will be very dull looking. as soon as you tip it around a bit the diesel inside will...