More pics might help? Its hurting my neck looking at it sideways. Looks like Happy or something along those lines.

 

 

 

 

I remember those lamps,installed many of them. Aside from the broken lens,a lot were replaced under warranty from corrosion of reflector and or water intrusion.
I know there were a couple versions sold thru Mazda parts dept as accessories.They both had the flip up stone shield with Mazda logo. One was made by Marchal and were the majority of lamps sold. There was another but don't recall brand name,also don't recall that script cast in the lens.
Highly unlikely you'll find a set of that particular lamp in good condition these days,if you did the price would be ridiculous for the sake of originality.
The lamp set wasn't of the highest quality,more a styling statement. Don't recall cost but do remember it cost more than the lamps to have them installed.
If those particular lamps are not a must have,in the years since they were made,lens/reflector/sealing technology on driving/fog lamps has improved greatly to where light output is much sharper and defined putting out much more usable light.
You can still find rectangular shaped accessory lamps of same approximate size from makers like Cibie,IPF,Hella,Bosch for not a lot of money that look period correct.