Own a 2002 KSDP with limited headroom and tray extension in the battery compartment. Difficult to check battery water level. Looking for a small (less than 6" in height) battery filler (has nozzle which when depressed into the battery cell fills the cell to the proper level). Only battery filler I've been able to find is at NAPA but it is large with a height of approx 12". Any stores or websites that carry such an item? Thanks!