[TR] Battery "Leaking"

[terryrs at comcast.net]

> Got home last night from class after about a 12 mile run on the freeway 
> doing about 70MPH and I noticed fluid in the battery tray liner when I 
> was checking for antifreeze leaks because I had replaced the radiator last 
> weekend. Turns out it's barrery acid (it ate the paper towel I was using to 
> wipe it out of the liner). 
Which raises a tangental question.  I remember reading on the List some time back, that modern self-contained batteries don't leak acid like the old capped resevoir kind.  Nevertheless, coming from that era, I'm condition to worry unless I have a plastic battery tray to protect the metal battery container on the TR3.  I can't seem to find one of these.  JC Whitney had one, but OOS.   For probably no other reason than my piece of mind, I have an ugly patch of old innertube filling the gap.  
Anybody know where plastic trays are available?
Terry Smith, '59 TR3
New Hampshire