The black strips are a pre-facelift thing
The black behind the door handles are plastic paint protectors. They were a factory option to stop all the scratches you get from peoples long fingernails when they open the door
It's probably been posted before but I've never seen one before:
http://www.nissansilvia.com/forums/index.php?showtopic=258762&st=0&p=3539547&#entry3539547
Toyota ST215W Caldina- 1998 auto
2L 3SGTE (MR2) Turbo 4WD.
(This one has an Aero Kit)
Also note the Pre-Facelift VR4 in front of it :P
Well I have coilovers so they shouldn't foul there. Maybe on the knuckle as said...
Why would you need custom brackets to suit? They're the same width and thickness as the 3000GT's