There's a guy in Melbourne who does them. Have a read through this thread:
http://www.ausjeepoffroad.com/forum/...highlight=spal I thought about getting one when mine died a couple of years ago, but didn't have enough to hand at the time, so got an OEM from Rockauto instead.
And here a a whole
bunch of threads when you search JK for SPAL. Plenty of reading & research for you from those who have used them, unlike me!