I originally posted these in the For Sale album, then was asked to post here for reference purposes. More info can be found at: http://www.insulators.info/go-withs/battery_rests/battery_rest.pdf
The original For Sale post in part:
"These glass battery plate holders/separators are great go-withs for your battery rest collection. The shorter pair on the top shelf can be rather difficult to acquire, plus the ice green color of the two left ones can be considered scarce."