dual batteries

My local GM dealer offers two left side (auxiliary) battery trays for my 85 longbed with a 305H motor; one is just described as "LH" (left hand) and the other is listed as "diesel engine". Does anyone know what the difference is? I'm thinking maybe the diesel one is set up for a bigger battery? I like to run two batteries with an isolator; it's nice to be able to jumpstart yourself from the cab or have two batteries to jump someone else in need...

[gchemist]

I think they are both the same size. The diesel option is only used to indicate that it was an option and used on the right hand side. I guess they don't have them instock but may be some with a diesel truck can tell us if they are the same size.

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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/