New a deck, b foldy. you might have to look hard for a new a that fits the b foldy though. if you can't find one, find an old a.
new a headtube, or pro, doesn't matter.
stock headset
fork- personally i like a bit of a heavier fork, soo try inward .083's, or find an SR threaded and reinforce it.
stock bars, bolt everything. if you want something cleaner go for french ID's, or wait for alu inwards.
XT metalcore front wheel, eagle metalcore back wheel, both 100mm. if that can't happen, just try to find any wheel with a ton of urethane for the front, so it lasts longer if you do a lot of sliders. i never break back wheels though, soo idk what best for that.
Pro brake.
New a abec 5 bearings, broken in and cleaned/lubed with 3 in 1 oil will be perfect.
grips- animal edwins, once they're worn in they are amazing.