help with engine mount, extra 300xs
 

I am installing an OS1.6 in a sig extra 300xs. The composite mounts that come with the kit do not seem substantial enough, so I was wondering if anyone can help with info on a mount they have used in the 300xs with a 1.6. The plans call for a 6inch dimension from firewall to hub, so I was not sure if the JTec or OS predrilled mounts would work. Thanks for any advise.
Herb