Brian, this website below lists some specs for the 5342366 part shown in the G749 manuals. The cross sectional shape (u-cup) and the dimensions shown exactly match the ones I removed from the Chaffee,so I'm pretty confident these are the same part.
Do you have any?
Also part # 5342367?
Malcolm
https://www.wbparts.com/rfq/5330-00-534-2366.html