Chum
I have Lee Heavy Duty rod holders on the boat and they do come with white rubber inserts. They do not come with backing plates. If you are interested, I have four backing plates with all hardware for the 30*, 15* or 0* Lee Heavy Duty rod holders (30* shown below). PM me and we can work out a price if you want.
These holders: 30* HD Rod Holders
work with these backing plates: Backing Plates for 30* HD Rod Holders
Sorry for the sales pitch but thought I might be able to help you out
Thanks
Fintan