We have new Hydac accumulators for the IV series. These are 3000 psi, 0.5L volume, with the cold temperature bladder material (good to -40) which is best suited for high altitude temperatures and winter ops.
Hydac makes the Parker units so that's why they look similar. See pictures below. The pressures for preset of the bladder can be discussed here also. There actually is some science to the preset and the pressure depends on how the accumulator is used.
Contact Sales for current pricing and availability.