Hello, I have x chocks and they fit my 34REQ just fine. I went to their website and noticed two different kinds though. I have the deluxe x chocks and they collapse smaller than the standard verison. That may be the difference. Hope this helps.....
Bill and Sarah
2008 F350 Lariat Crew Cab Diesel DRW 4X4
2012 Sabre 34REQS