To see a really great selection of sliding glass doors from many vendors go to: http://www.faucetdirect.com/bath-shower-doors/.
Great prices too and they stand by the all purchases.

VJ, When I clicked on the link above myself, the page no longer exists. The shower enclosure you see above is custom size so it could not be purchased off the shelf.
In addition, the hardware is made by one manufacturer and the glass and installation
is provided by your local glass fabricating company. They'll come, measure, order the hardware, fabricate the glass as needed for your shower and come back to install it all. They should offer warranty on their work. One thing you need to know about this is that
only one panel (the door) moves, the other it's stationary. Make sure this works for you.
If you really like this one, ask your local glass company for "Hydro-slide". It may be
marketed under another name in your area or they may offer another brand. Good luck!

Thank you both so much for your help !!!

You are welcome! I hope your project is successful and you're happy with the results.

Ms. Leone, I just found your question in Comments. The finish in both niches is a custom stained cherry veneer. The material on the walls surrounding the niches is a natural stone - in this case Seashell Limestone. The ceiling and the door are the only painted surfaces in this bathroom.

Thanks so much for your response. The bathroom is quite beautiful!