72" Low Profile Track Assembly

Hello, I need replacement top and bottom tracks for two 36" bifold mirrored closet doors. Are the top and bottom tracks different? Is it better to do two 36" tracks or one 72" track? Thanks!

Good morning, We are seeking tracks and hardware for reinstalling our new doors. The attached photos show the doors in which we want to install the new tracks and the photos of the old tracks. Please review and provide quotes. Thank you! Best regards

3" long, upper portion is 1/2"W, 7/8"W when measuring bottom side (wings). The lower track has two grooves or tracks. The track has gotten bent wider over the years and this falls down to the bottom of the track and then the door falls off. Possibly need replacement track and bottom door holder ... (cont.)

Float away mirrored bifold doors upper and lower guides

I have a double four panel doors the bottem track has two nylon 3/4 in round guides. They have disintegrated and now the doors will not slide. Rhe doors were manufacture by Renin and I believe the model is 88120. The track is 72in long. Have added photos