You can duplicate the TTT rear coilovers fairy easy. 
 
	S13 AGX rear shocks. KYB 741017 Shocks For 89-94 Nissan 240SX Rear LH or RH 
 
	Clamp On 2 Bolt Steel DOM Fabrication Clamp 1.75" Roll  from eBay
 
	Springs and threaded coil over sleeve
 
	The only tough part is making the top hat, I turned my stock top hats down in a lathe. You could do it in a grinder.  
 
	 
 
	PM me if you want more info.