That doesn't mean that there are no differences in the alloys, plate mass and sizing, etc.

Ive not had good luck with WM batteries.

Advance auto silver line is the best value going. Don't know if it fits, but they also sell an H9 battery which is a tad bit larger than a 49, has serviceable filler ports, and more CCA and RC because of its size/mass, not tricks on the plates.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)