Searched Mopar mahle pistons
First result:
Mahle Pistons 930271030 Forged Dish SB Mopar 4.030 Bore
They're there.
OP sounds like he knows exactly what he's looking for. I bet a message or phone call would be the best way to find out what they've actually got in stock to ensure a smooth experience.
My local machine shop got stuff through them when they worked on my engine a couple years back. No problems.
