broken window part

Hmm...I am afraid your options are limited. There is a strong possibility you may have to bring in a whole new replacement window. Although you may have all the window manufacturing information, that does not always guarantee a replacement sash will fit right into the window. If you're comfortable with doing this, you may try cutting a piece of wood to fit inside the hollow vinyl rail, thus, securing it and proceed to install the pivot bar. We apologize we could not offer better news.