997 Spare PCM buttons

[RDMcG]

The small rectangular buttons on my PCM have an infuriating habit of falling off. The solution from Porsche appears to be to replace the entire PCM unit for the sake of a two cent piece of plastic. I know the large round buttons are available as relplacements but cannot source the small ones. Scrapyards want to sell the while unit. I live in fear that a one gets lost or vacuumed up by an enthusiastic valet. Appeciate if anyone has a source.