Marco's has a few parts for Gladiators including the translite your looking for. http://www.marcospecialties.com/control/keywordsearch?SEARCH_STRING=Gladiators%20&VIEW_SIZE=60&VIEW_INDEX=0&view=card&sortOrder=SortKeywordRelevancy
If you were wanting playfield glass as well then you can get that at any glaziers shop local to you. Just measure the size you need and make sure you ask for toughened glass with polished edges.