Great I wanted to be sure they where rubber because I really didn't want a solid mount due to vibrationI used them in my Merc V6. The originals had an aluminum band around the middle. The Sierra mounts are all rubber, but fit perfectly.
I had trouble finding them. They seemed to be in short supply. Replacement Merc OEM mounts were twice the price or more.
Yes I had to order from 2 different sellers as well the 1 I got yesterday was solid plastic so i reached out to the other seller and he said the 1 he shipped me is solid rubber I'm worried that the plastic 1 will cause a vibration in the transom which will effect my image on my side scan which is an issue i am fighting with my boat with the i/o mercruiser engine... so i dont think i want a solid mount that is why I didn't use the solid aluminium mount that Bob makes ...My Sierra mounts were solid rubber. They took some searching on the internet to find them. It looked like e-Bay and Amazon only had 1 between them. I found them at some less popular website.
If yours are solid vinyl, they might be OK.