Replacement battery tray, support, original clamp & bolt are all still available at several of the online sources you see here (AA is one noted above), as well as for the Optima battery & the clamp for it. There are also lightweight dry cell batteries out there which a lot of folks use. Here are some sources for both.
Note that the Optima is a gel type wet cell, and Odyssey is a drycell - but both are lead-acid batteries & therefore both do have acid, just not in the liquid wetcett type of the standard car batteries.
Also get an acid pad for the tray under the battery, as well as protectant to spray on on the tray.
http://www.optimabatteries.com/home.phphttp://www.summitracing.com/search/Brand/O...s/?autoview=SKUThese are both sold many places - both online & bricks-n-mortar stores.