Overview

Tunnel is made up of two body panels: The lower dash (firewall) and the front floor, which has the shifter hole and the gearbox crossmember mount brackets.

63-series 5-speed and Automatic Transmission use the same tunnel.

56-series and Automatic use the same size tunnel entry.

B210

B210 JDM Late

67300-H7400 DASH-LOWER A12+14.F4,AT also Van.7510-
67300-H7900 DASH-LOWER A14.F5 [FS5W63A]
67300-H7900 DASH-LOWER L16 [FS5W63A]
* also used by PB210 L14

74300-H7401 FLOOR-FRONT F4
74300-H7421 FLOOR-FRONT AT+F5 [FS5W63A]
* same as late USA
74300-H7800 FLOOR-FRONT V.7510-

B210 JDM Early

This indicates that Auto and Manual share the same tunnel entry (same size opening).

67300-H5000 PANEL ASS'Y-dash lower
67300-H5001 PANEL ASS'Y-dash lower (from '74-9)

This indicates latter part of the tunnel varies Auto vs Manual, possibly for the gearbox mounts.

74300-H5000 FLOOR ASS'Y-front M
74300-H5020 FLOOR ASS'Y-front A

PB210 L14

This indicates Tunnel entry same for auto or manual, and 4-speed too (by cross-reference regular early B210).

67300-H5800 PANEL ASS'Y-dash lower
67300-H5801 PANEL ASS'Y-dash lower (from '74-9) < 67300-H5800
67300-H7900 PANEL ASS'Y-dash lower (from '75-10) Sedan except DX
67300-H7400 PANEL ASS'Y-dash lower (from '75-10) Coupe except DX

74300-H5000 FLOOR ASS'Y-front (up to '75-9) 4-speed
74300-H7401 FLOOR ASS'Y-front (from '75-10) 4-speed except DX
74300-H5020 FLOOR ASS'Y-front (up to '75-9) Automatic, 5-speed
74300-H7421 FLOOR ASS'Y-front (from '75-10) Automatic, 5-speed except DX

B210 North America

Coupe & Sedan use the same tunnel body panels.

North America B210 has eight different floor pans:

4-speed
 1976-1978
 1975 with Converter bulge
 1975 without Converter bulge
 1974 - same as JDM early

Automatic/Five-speed
 1976-1978, fits 63-series 5-speed FS5W63A
 1975 without Converter bulge
 1975 with Converter bulge
 1974 - same as JDM early

67300-H7700 ASSY-PANEL, DASH LOWER 0877-
67300-H7301 ASSY-PANEL, DASH LOWER 0875-0777
67300-H7300 ASSY-PANEL, DASH LOWER 0974-
67300-H6100 ASSY-PANEL, DASH LOWER -0874

74300-H7401 ASSY-FLOOR,FRONT (MANUAL) 0875-
74300-H7200 ASSY-FLOOR,FRONT (MANUAL) 0974-0775
74300-H7300 ASSY-FLOOR,FRONT (MANUAL)CAL. 0974-0775
74300-H5000 ASSY-FLOOR,FRONT (MANUAL) -0874
74300-H7421 ASSY-FLOOR,FRONT (5-SPEEED) 0476-
74300-H7421 ASSY-FLOOR,FRONT (AUTO) 0875-
74300-H7220 ASSY-FLOOR,FRONT (AUTO) 0974-0775
74300-H7320 ASSY-FLOOR,FRONT (AUTO)CAL 0974-0775
74300-H5020 ASSY-FLOOR,FRONT (AUTO) -0874

B310

Japan Market

All the same, automatic, 63-series 4-speed or 5-speed

67300-H8500 DASH-LOWER ALL

74300-H8500 FLOOR-FRONT

= North America

67300-H8800 DASH ASSY-LOWER ALL 
front floor, not listed. appears to be catalog mistake

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Tunnel Comparison

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