the bumpstop consists of three parts...the bumpstop cup, the jounce bumper and the bumpstop bolt (metric M10). for a lifted vehicle, there is a fourth part - bumpstop extensions.
what part do you need to replace?
bumpstop cups can be had cheap from any junkyard. ZJ fronts will fit TJ front and rear. same with jounce bumpers, but those can deteriorate with time. Crown Automotive PN 52087636AC is an OEM style replacement jounce bumper. any Chrysler dealer will also sell both.