Door Track
Greetings! I believe your mirror doors are using Slimfold door pins so you can use the 21-404 for your 48" tracks. Our tracks are 5/8" tall so they might not meet your idea of low profile.
The doors aren't made to use a bottom corner pivot because of the weight of the mirrors. However, you could try to see if the 23-316 corner bracket with the 21-003 bi-fold door pivot will hold the weight. Our return policy can be viewed here.
Unfortunately, I couldn't find a pin combination for the two tracks you mentioned. I'm afraid they are designed for wood folding doors, not the mirrored door you have. I am very sorry for the inconvenience.