This is the wheels but I need the track

Thanks for reaching out! The closet door roller you have here is the 23-041 Mirror Wardrobe Door Roller Assembly. This is used along with our convex style tracks. 

The track with the closest length to yours is the 23-240 48" Sliding Mirror Door Bottom Track. You will need to cut it down to the 45-1/2" size you need.

Profile view of sliding mirror door bottom track