Why did you feel, you should change Gardry??? Get it checked from someone else.... Moreover, it should cost even much less than 15K. Will you believe I bought one for my Margalla in around 2000 & get it installed/welded whole package in 4500. 2.5 years ago. Gardry is not a rocket science neither it is some complex electro-mechanical part of a space ship.... It is just a metal rod (hollow from inside) to keep the wheels at right distance & strengthen the Frame. It can be repaired easily but I don't think u will need that even....
I have owned 3 cars & every denter told me to change the gardry or it may break & cause serious mishap....... the gardry of Margalla that I replaced was also perfectly fine but denter mis guided me to make mony... SO BEWARE.