Your search for "spare parts" revealed the following:

2-pin connector, pack of 4: Sakatsuo Electronic parts, non-scale 2900

Square nuts, bolts and washers: Grantline unpainted parts O(1:48) 16

1.6x0.8mm chip LED red with connector, 2 pieces : Sakatsuu Electronic parts - Non-scale 2501

1.6x0.8mm chip LED, red, 2pcs : Sakatsuo Electronic Parts Non-scale 2203

Fog generator module option water supply wick (3 pcs.) : BitTradeOne Material Non-scale MMSTGN-OP1

Coin cell CR1220 constant light board : KEIGOO Electronic parts Non-scale 99030

1.6x0.8mm Chip LED Yellow 2pcs : Sakatsuo Electronic Parts Non-scale 2202

LED module with magnetic switch 3 set : Green : BitTradeOne Electronic Parts Non-scale ADMGLGR3

LED Light Control Board : Sakatsuo Electronic Parts 2402

1.6x0.8mm chip LED white with connector, 2 pcs : KEIGOO Electronic Parts Non-scale 90111

LED module with magnetic switch : Warm white : BitTradeOne Electronic Parts Non-scale ADMGLWW

LED module with magnetic switch 3 sets : White : BitTradeOne Electronic Parts Non-scale ADMGLWH3

LED module with magnetic switch 3 set : Purple : BitTradeOne Electronic parts Non-scale ADMGLPR3

LED module with magnetic switch with leads, set of 3: white : BitTradeOne Electronic Parts Non-scale ADMGLWWHH3

Square nuts and washers: Grantline unpainted parts O(1:48) 44

LED module with magnetic switch with leads, set of 3: yellow : BitTradeOne ELECTRONIC PARTS NON-SCALE ADMGLWYE3

1.6x0.8mm chip LED bulb color with connector 2pcs : KEIGOO Electronic Parts Non-scale 90101

LED module with magnetic switch 3 set : Yellow : BitTradeOne Electronic Parts Non-scale ADMGLYE3

Ultra-compact controller Flicker 0.5:0.5 : KEIGOO Electronic parts Non-scale 92011 Sales start campaign! Special price 660 yen (regular price 990 yen)

LED module with magnetic switch 3 sets : Blue : BitTradeOne Electronic Parts Non-scale ADMGLBL3