The shoulders are pretty nice for torque limiting though. I do think gasket life could be shortened if it gets overtightened.
What about trying in a junkyard? There were a million different vw audi vehicles that used these exact same shouldered studs on the valve cover. Not just diesels, but gas engines, 4cyl, 5cyl, etc. Any old VW Transporter, Jetta, Golf, etc will probably have them.
If you can find a donor vehicle, might as well grab a handful so you have some spares.
