SDF15
Length=5.276" Thread=3/4 X 16 Gasket I.D.=2.467"
SDF26
Length=7.125" Thread=3/4 X 16 Gasket I.D.=2.467"
SDF80
Lenght=7.131" Thread=3/4 X 16 Gasket I.D.=2.467"
The SDF80 is a little longer, but has also been replaced by the newer Donaldson Oil Filter which has better filtration capabilities. Hope this helps out.
Length=5.276" Thread=3/4 X 16 Gasket I.D.=2.467"
SDF26
Length=7.125" Thread=3/4 X 16 Gasket I.D.=2.467"
SDF80
Lenght=7.131" Thread=3/4 X 16 Gasket I.D.=2.467"
The SDF80 is a little longer, but has also been replaced by the newer Donaldson Oil Filter which has better filtration capabilities. Hope this helps out.