Probably not helpful for you at this point, but
Iron front caliper w/new pads, 2x mounting bolts(54g), and the stubby hardline(26g) - 4.53kg
260/280 front rotor, new - 5.27kg
Front brake shield w/hardware - 0.505kg
Rear aluminum drum, pads, backing plate, hardware, short hard+soft line, worn ~30% - 5.92kg
Complete front brake assembly weight per side - 10.3kg(22.65lb), rear - 5.92kg(13lbs)
My setup for reference added 18.32lbs compared to the OEM disc/drum setup
Front - Z32 aluminum caliper(2.795kg), pads (0.735kg), Odyssey 296mm rotor(7.7kg), adapter, and hardware - 11.73kg (25.81lbs)
Rear - VW aluminum caliper(2.55kg), pads (0.38kg), Z31 84-86 NA rear rotor(4.96kg), adapter, and hardware - 8.64kg (19.0lbs)
Seats aren't 35lbs. The stock vinyl seat is 11.65kg(25.6lb) without the sliders and 13.70kg(30.1lbs) with them.
Antigravity ATX30 restart battery, no terminals 2.45kg
Front subframe, no hardware - 4.95kg
Front subframe with engine mount risers removed - 4.28kg
Brake booster with aluminum clocking plate - 2.78kg
Wilwood 1" master w/Z reservoirs - 0.90kg
Front tow hooks pair with 4x bolts - 0.88kg
Stock 240z/260z spare - 17.1kg
07-12 Sentra 16" spare - 12.28kg
Konig Rewind 16x7 with 205/55 Firestone Indy500 - 17.56kg
Factory scissor jack 3.21kg
Front early 260z bumper mounts with hardware, pair - 4.80kg
Front early 260z bumper, no rubber trim panels or end mounts - 4.67kg
Horn pair with hardware - 0.96kg
Steel splash pan with hardware - 1.71kg
front control arm w/rubber bushing- 1.20kg
Outer tie rod - 0.61kg
front ball joint - 0.70kg
TC rod, no bushing/washers - 0.785kg
240z front spring - 2.175kg
front spring top hat - 0.26kg
Eibach 10" 225lb 2.5id spring - 1.135kg
OEM strut top isolator w/hardware - 0.82kg
Strut top bearing - 0.145kg
260z Front hub with bearing and grease, no studs - 3.04kg
4x ARP 2.7" extended studs - 0.223kg
Rear control arm with poly bushings, spindle pin, and M20(?) bolt - 5.46kg
Rear strut, shortened 1.5in w/5" aluminum coilover sleeve & adjuster, bilstein VW MK2 insert, stub axle - 11.78kg
Bilstein VW MK2 insert with gland nut and top M14 nut - 1.60kg
Front Diff/control arm mount w/4x bolts - 2.06kg
Front Diff rubber mount(inc 2x M12 bolts, 245g) - 1.33kg
Diff hold down strap w/hardware - 1.10kg
R180 mustache bar w/rubber bushings - 2.75kg
R180 260z with axles and fluid - 38.75kg
Subaru R180 3.91 torsen lsd, dry, no stub shafts - 25.40kg
4spd 260z driveshaft w/hardware - 4.25kg
4spd trans w/clutch fork & TOB, no fluid or shift lever - 34.90kg
260z trans mount beam, M14 bolts, and rubber isolator - 2.15kg
clutch disc and pressure plate - 5.20kg
OEM flywheel + crank bolts - 10.05kg
OEM chonky starter, not gear reduction version - 5.70kg
Champion aluminum radiator 2.25" core w/mounting hardware - 5.52kg
MSA aluminum dual fan shroud w/2x 12in fans + hardware - 3.07kg
260z steering wheel and horn pad - 2.33kg
steering column shroud w/hardware - 0.17kg
half dash cap - 0.60kg
260z console w/fat arm rest 2.53kg
Rear side/taillight panels - 2.00kg
Fender "assembly" with headlight bucket, hella H4, and side marker - 8.50kg
Hella H4, old west germany stamp - 0.505kg
koito H4, 2024 production 0.675kg
datsun headlight bucket and retaining ring w/wire harness - 0.60kg
Cowl - 2.09kg
early 260z grill - 1.07kg
Washer fluid bottle and pump - 0.225kg
hood prop rod and hardware - 0.16kg
Charcoal canister + bracket and hardware - 1.37kg