Interesting.... I haven't worked with hex much. I added the formula to the spreadsheet to calculate the SKU.Probably the better way to get the SKC is to stay in a hex calculator (the built-in calculator app in both Windows10 and macOS have a "programmer" display where you can work in base16 = hex mode).
So, in one of my clusters: the three pairs bytes starting at 204 (0xCC in hex) are D3 1F D3 1F D3 1F.
Decimal 256 = 0x100 (hex)
So in a hex calculator, simply enter 1F*100+D3 = 0x1FD3 = 8147
This was confirmed by what I got out of VAG-TACHO.
And in case you didn't notice the pattern there, you can actually skip the whole calculator thing: Just flip the two bytes (D3 1F becomes 1FD3) and enter that as a hex number into a HEX2DEC converter (=HEX2DEC(cell) in Excel does the trick, too) and convert to decimal. Done and done!
(Under VIEW menu, choose PROGRAMMER to get this calculator layout):