Difficulties in parts search?

Parts list

Difficulties in parts search?

	Description	OEM Part #	Price
1	1 816626A15 Harness Assembly Key Switch (15.00 Feet) (15 FT.)	816626A15	US $229.42
1	1 816626A20 Key switch assembly (20 FT.)	816626A20	US $247.07
2	2 90468A1 New Genuine Part	90468A1	US $4.45
3	3 76424 New Genuine Part	76424	US $13.68
4	4 55422 Stud, , control panel to boat	55422	US $5.79
5	5 24676 Washer, , control panel stud	24676	US $1.28
6	6 68219 Nut, stainless steel	68219	US $3.40
7	7 816479A3 Plate kit-mount	816479A3	US $39.89
8	8 88107A5 Switch Kit Key	88107A5	US $76.02
9	9 879755 Nut, special - black nylon (Black Nylon)	879755	US $5.46
10	10 816492A1 New Genuine Part Lead Length is 2-5/8 Inches	816492A1	US $64.10
	replacement
10	10 8M3001068 Alarm Assembly Audio Warning Lead Length is 2-5/8 Inches	8M3001068	—
10	10 816492A2 New Genuine Part Lead Length is 6 Inches	816492A2	US $65.18
	replacement
10	10 8M0089727 Alarm Assembly Lead Length is 6 Inches	8M0089727	US $65.18
11	11 8127111 Spacer (3/8 Inch)	8127111	US $3.71
11	11 812711 Spacer (1/4 Inch)	812711	US $3.71
NI	NI 894911 New Genuine Part	894911	US $5.49
NI	NI 894912 New Genuine Part	894912	US $5.49
NI	NI 894913 New Genuine Part	894913	US $5.49
NI	NI 894914 Key 1d 2	894914	US $5.49
NI	NI 894915 Key 1e 2	894915	US $5.49
NI	NI 894916 Key-1f 2	894916	US $5.49
NI	NI 894917 Key-2a 2	894917	US $5.49
NI	NI 894918 Key 2b 2	894918	US $5.49
NI	NI 894919 Key-2c 2	894919	US $5.49
NI	NI 8949110 New Genuine Part	8949110	US $5.49
NI	NI 8949111 New Genuine Part	8949111	US $5.49
NI	NI 8949112 KEY Ignition (2F)	8949112	from US $5.49

Key Switch Diagram Mercury-Mercruiser E2.5 18245772-946005