Durometers and equivalent Shore Hardness

[Frank S]

Not sure of exactly what you need but running shoe soles fall in the 70a range while fire-mans boots will have soles around 80a the density of any pressing block would need to be harder than the soles being bonded probably nearing 90 a to 100a Think of th ehardness of the average shopping cart tire as 100a
I am thinking that replacement blocks could be made from poly urethane the same type as one would cut hydraulic cylinder seals out of the chart below may help