Need small black plastic part

Hello, thank you for posting,

It appears that the black slider on your hinge has broken. Unfortunately this part is not available by itself. You will need to replace the full hinge assembly. Please start by reviewing the 36-048 2-bar hinge set that has a 10" sill track. 

Compare to your original to confirm a good fit! We also carry a 14" sill track under 36-049. Please note that both the top and bottom hinges will need to be replaced at the same time. 

Take a look at the video and overall specifications. Let us know if you have any questions!