This is a set of 10 New autolite spark plugs part # T7 that fit Harley Davidson and Indian motorcyles up to year 1926.
Auto-Lite T7, 3/4" thread, 18 TPI. 22 mm across outside diameter of the thread.
Slightly shorter than the plug made for the Model A Ford,(3/4" reach) which seems to be the only 22mm plug still made.
These plugs look in keeping on older bikes unlike the modern replacements.
- Listed as fitting 1910 up to 1926 harley davidson and Indian motorcycles