Please could you suggest replacement parts?

[adrianblakey]

JLCPCB can't obtain:

TC212A335K016B/C124836 - 3.3uF 16V 5Ω@100khz ±10% CASE-A-3216-18(mm) Tantalum Capacitors ROHS
A2005WV-3P/C225255 - Gold Direct Insert Policy 3P 4mm -40℃~+105℃ 2.8mm 2mm Single Row Black Brass

Please could you provide alternatives?

[kbjunky]

In such case one need to head over to LCSC.com page and look for parts with the same values/footprint.
TC212A335K016B/C124836 -> C7184
Also all the headers are described, number of pins and pin pitch so it's easy to find a replacment.
A2005WV-3P/C225255 -> C541857

[adrianblakey]

Would this work? https://jlcpcb.com/partdetail/-TAJA335K016RNJ/C7184
https://jlcpcb.com/partdetail/352156-B_2102S03PA110/C379808

[kbjunky]

Cap is gave you the same. Pin header should be good. 3Pin 2mm pitch.