I bought one from JC Whitney for my 142 but the clamp wasn't deep enough to securely attach to anything. The body panels also seemed thicker than the clamp could accommodate.

I've thought of getting a stock mirror from a junked 140 but attaching powerful magnets in the base. I also don't want to drill holes anywhere. An old computer hard drive has two very strong magnets in it. I might try this someday when I get time.