Not sure what you mean Mel but the racks I posted were made by Sonar, he hasn't been seen on the forums for quite some time. He did at one time make some beautiful wood mods.Tomorrow when my mind isn’t bleary from travel ( and a 5 hour nostalgia tour of every place in western Ky my 83yo mom wanted to revisit), it’ll come to me exactly what they are. Check a scientific supply house/catalog. They use them in biology?/ lab? settings. Shouldn’t be very expensive.