In a strange twist of fate, I ordered new pucks after 6wks of the original ones being in Auspost. 30mins later, I got the first notification in over 6wks from Auspost and now they arrived! So, I'll onsell the second set when they come. These have a red O-ring and I just checked and they fit perfectly. They are 25mm thick.
On my 3LR, I measure 120mm from the puck face to the ground. That fits very nicely with the claimed 145mm ground clearance. I estimate I will lose a further 40mm with a flat tyre, leaving a mere 80mm for the jack. I know there is a Porsche jack that is supposed to fit but they appear a bit rare and also steeply priced.
If I can get a jack that goes close, I can perhaps cut 10mm off a couple of these pucks so I have two of 15mm and two of 25mm.