I can’t tell from your photos but…..
Are they rubber or more of a harder plastic?
Regardless……I gotta believe there’s got to be an answer to your need at Lowe’s or Home Depot. Hardware or plumbing section. Take a good one with you to compare.
Last choice would be a good RV parts shop, but $$.
Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count