A3 8L: Extend 5th Gear (AHF/EBF)

Hi,
Since I drive on the highway 90% of the time, and I've always been bothered by the 3000 RPM at 140 km/h, I've now started looking into different sets of gears.
Currently, my translation score is 0.76, and the new score would be 0.71.

Unfortunately, I don't quite understand the gear designations.
My EBF should be a 02JA model, and the new gears (part numbers 0203111599 and 0213113613) appear to be from a 020 transmission based on the part numbers.

Can you shed some light on this, or does anyone have anything else suitable available?
Best regards,

Does it bother you that they come from a 020 gearbox?
My A3's engine came from a T4 Syncro.
Okay.

I don't quite understand what a "020" transmission is.
I thought that by looking at the letters, it wasn't a 020 transmission, and that helps me a lot, thank you .