I have a 280 which I bought new over 20yrs ago. I donít think they called them Rovers then but they seem to be pretty well the same.
I ordered a 3 point lifting kit with it which was I think an Avon part but not factory fitted. I donít think they gave factory fitting as an option.
From what I recall this kit comprised of backing plates machine screws washers and the eye. I drilled three holes through the hull, sealant, backing plate on the outside of the hull, washers and then the eye. Quick and easy! The backing plates, from what I can remember, are about 10cm x 5cm but I can check some time next week if you want.
I canít recall any certification coming with the kit but as I mentioned this was over 20 years ago.
The Rib was used as a tender and we would use these lifting points to attach a wire strop and then lift the rib onto its cradle on deck. The rib itself is very light but we would have a fuel tank, various safety kit and some water bottles permanently stored in it. Sometimes we would lift it with a yam 8 2st still attached. I never had any concerns over this.
If your lifting points donít have these backing plates it could be that they are Avon factory fitted (have you tried contacting Avon) or that they are retro fitted by somebody else and may not be lifting points at all but just eyes for securing loose bits of kit.
Hope this helps