any web site i can get the os engine mount specs

Exactly what do you mean by "engine mount specs"? Are you asking about mounts, or the mounting requirements of an engine?

would like to know specs
eg; distance from firewall
to give overall length

We still don't know what "specs" you are looking for. The size of engine mounts or the measurements of an engine that's mounted? If it's of an engine that's mounted, then the mount you use can determine a lot. As far as the O.S. engine mounts, some were measured when the tech notes were made. We'd need to know which particular mount. We don't have a form/paper with all the info printed on it.

so i know the overall length from firewall to prop

so i know the overall length from firewall to prop
as os mounts are pre drilled and taped none ajustable
to know before you bye would help

We don't have such specs. O.S. only sells the mounts. Some have been measured by our staff as to where the mounting holes are located on the mount, and you'd have to go from there, relating those distances to the engine. We'd have to know the specific mount you're looking for, we don't have a chart with all of them on it.