Where to buy t slider window track replacement?

T slider window in our 2000 Dodge Ram van 1500 leaking. Just cleaned out weep holes, helped a little but noticed the window track where window slides is broken. I’m having a hard time finding where to buy replacement from. Some say I will need to diy a replacement.

It’s narrow and made of plastic...help please it’s been raining and don’t want to get water damage inside!