My '88 had a monster Interstate battery (MTP-93 like yours) that was still good after 10yrs but the PO had installed it without connecting the vent tube. When I started to Autocross the battery started to leak from the vent and caused some minor damage before I discovered the problem. I installed a somewhat smaller Diehard AGM which actually has more capacity. I had to make a very simple custom mount out of a plastic cutting board which is held down with the original clamp. I was also able to use the original battery cables. Here is the one I bought.
Detail of clamp at front. This is the clamp to remove when you pull your battery. 
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88 Triple Black 911 Carrera Cab, ex Garage Queen
05 BMW E46 M3
21 Tesla Model 3 LR
08 BMW 328xi
15 Ford F150
Last edited by msterling; 03-16-2014 at 08:22 AM..
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