Hi James,
Just registered as a Newbie myself in the hope of getting some help for my Super Sports Gear ...and lo and behold instead I can help you with some info, I hope! ( ...well they keep on telling me it's better to give than receive....especially if you in jail at the time!!)
There's an outfit I've been in touch with in Oz at
http://www.xspeed.com.auThe guy who's replied to my mails is Hanson Yeoh. Apparently they do RSR lowering springs which lower the vehicle by about 55mm on the front and about 45mm on the rear. These are the same part for all variants of N23W RVRs.
They also do uprated shocks by KYB specifically for the HSG. They are Perth based I think.
Contact details:
Tel: +61 8 9331 8088
+61 8 9337 3288
Fax: +61 8 9331 8988
Mobile: +61 438 688 888
email: hanson@xspeed.com.au
Hope that helps..... greg.