Welcome to the forum.
Try this contact, they supply a lot of shower doors to the industry. It is a name/number from long ago, but maybe???
Customer Service/Sales (574.522.1446)
Irvine Shade and Door, Inc
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired