Yoke seal

4 Seals for the extension housing on a 904, 2 with a boot, 2 without a boot.
1966 to 1972 without a boot 2.254" o.d
1973 to 2003 with or without a boot 2.375" o.d
and lastly 1973 to 2003 2.445" o.d.
Hope this helps.