The Hino SG3320 front turn signal bulb uses a 1156 size, while the rear turn signal bulb uses a P21W size. The replacement chart covers 1993 to 1995 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hino SG3320 uses two distinct turn signal bulb types across its front and rear positions for the 1993-1995 model years: the 1156 at the front and the P21W at the rear.
Despite carrying different designations, the 1156 and P21W are electrically identical, both operating at 12V with a 21W single-filament configuration.
Both bulb types share the BA15s bayonet base, a single-contact base design where the "s" denotes a single pin offset to one side of the base.
The 1156 designation follows the ANSI standard, which governs bulb specifications in the United States and Canada.
The P21W designation follows the ECE standard, a regulatory framework used in Europe and numerous other markets worldwide.
Although the BA15s base is physically the same on both bulbs, the 1156 and P21W originate from separate standardization systems, and substitution between them warrants verification of base pin alignment and envelope size before fitment.
The front turn signal position on the Hino SG3320 calls for the 1156 across all three listed model years, 1993-1995.
The rear turn signal position on the Hino SG3320 calls for the P21W across the same 1993-1995 span.