You can buy rancho 9000's in the proper size to fit the stock sami shock locations.
but...
In my opinion it would be a waste of money to pay that much for those shocks and not get the full potential out of them. In the stock position you will not get much axle travel and you will end up wanting longer shocks eventually.
So, I would either:
a) buy some cheapo shocks now and run them until you do your lift and/or change your existing shock mounts
or...
b) modify the mounts now and get the longest travel shocks you can in the 9000's or whatever.
Of course this is all my opinion, if you have questions let me know.
HTH,
Robin.