I have 2 x TRS 6 point harnesses in black for sale. They are both in good, used condition with eye bolts holes on the lap straps, clips for eyebolts on the shoulders, and straps that loop round the base mount for the crutch straps.
They say FIA B-104. T/98, FIA C-105 T/98, FIA D-107 T/98 - not valid after 2006
I've just bought new HANS belts as the 3" shoulders don't sit too well and I need in date FIA to compete overseas, otherwise I would carry on using them for hillclimbing as scrutineers here have never had any issues with them. I think the shoulder buckles are steel, same as the lap ones.
Can send pics if you're interested, £150 the pair delivered UK mainland!