Are the wires cut right at the switches ? If not I don't see why you can't solder them ? It does not appear that the package comes as a kit but rather all separate items. "IF" you have to, or just want to replace the whole harness, it might help you to see what you are up against by searching this forum for my Handlebar install video. It will show you where you pull the wires loose from the main harness.
2004 fxdli
1 SCREW 4
2 SCREW 4
3 CABLE STRAP (AS REQ'D.)
4 RETAINER 4
5 CLIP 1
6 HOUSING, LOWER - RIGHT 1
7 HOUSING, UPPER - RIGHT 1
8 HOUSING, UPPER - LEFT 1
9 HOUSING, LOWER - LEFT 1
10 SWITCH ASM., ENGINE STOP/START (W/ REF # 3 & 20) 1
11 STOPLAMP SWITCH (W/ REF # 3 & 20) 1
12 SWITCH ASM., RIGHT TURN SIGNAL (W/ REF # 3 & 20) 1
13 SWITCH ASM., DIMMER & HORN (W/ REF # 3 & 20) 1
14 SWITCH ASM., LEFT TURN SIGNAL (W/ REF # 3 & 20) 1
15 PLUG, 6- WAY SOCKET - RIGHT (BLACK) 1
16 PLUG, 6- WAY SOCKET - LEFT (GRAY) 1
17 SOCKET LOCK, SECONDARY, 6-WAY 2
18 FRONT SEAL, 6-WAY PLUG 2
19 TERMINAL, SOCKET 12
20 HEAT SHRINK TUBE, DUAL WALL, .3 X 2" (AS REQ'D.) 1