Potentiometers for the elektuur Preamp

I almost sourced all my components to build the elektuur Preamp. I just need the potentiometers dat are listed in the article.

- 10k log potentiometer: Bourns, Spectrol,...
- 10k log stereo potentiometer: Alps RKGA2-10K AX2

I didn't find that specific Alps type potentiometer and the Bourns, Spectrol don't specify a part number.

Can somebody suggest high quality potentiometers dat I can use in this preamp.

The article itself is in februari 1987 of elektuur.