Currently there are no shocks available on the local market for the SSS.
You can use regular swift shocks, but the car will be very soft. Monroe, KYB and Tokico shocks are available, at about 800 each.
I have a set of used D2 coilovers at $4000 if you want to go this way.
It has been my experince that coilovers on the softest setting, give a ride similar to the SSS.
Cater for a new pair of shock heads when you are ready to swap.