Myself I prefer a solid mount on the drivers side and I have always used a chain for backup even when I used the rubber mount on the drivers side. So I use a solid mount on the drivers side and a cheap piece of shinny chain for backup. I have used the solid mount for years and it has not caused any problems at all. Myself I am not a fan of eng plates on my street car as I rode in my friends with one and did not like the vibration his car had. Now maybe all eng plates are not like that but his sure had alot of vibration. I get barely no vibration from just the one solid mount on the drivers side. Ron