Search" bumperettes".
I don't think the eBay ones come with brackets and I have pulled them from 620's myself....
http://community.ratsun.net/topic/25022-bumperettes-for-sale/
I usually watch cops during my lunch break and they re-aired an episode that was filmed near me. I've seen it a couple of times but never did notice the 620 until today.
The cop kept asking the man if he had any drugs on him. The guy said "no" everytime. Guess he forgot the doobie in the ear. He was originally pulled over for driving intoxicated.
http://community.ratsun.net/topic/25884-rear-coilovers/
Your probably going to want the complete 280zx strut assembly not just the brakes.
I might have a weber carb.