Jim, I'd shim it as well

Vic... What you have there is a generic T-Rex. We all have to take prescriptions so you know that in the medical field the generics are just as good as the name brand. I held my T-RexSA in my hand while staring at the pictures Crash uploaded and I found 3 things different. One being that Vic's tail fin is slightly rounded and mine is straight. Second is I have a plastic block that is embossed, "ALIGN" right underneath where the gyro is usually placed. Last is the plastic under the battery tray, different cut outs. All screws look to be in the exact location.

Vic, take a picture with just the frame assembly and head and then one of the tail. I'll post the same. Let everyone compare. I swear it's the same bird as my SA.

Pictures of my SA

God Bless,

Jay