As far as sliding shower door systems, the brands I have sold that are quality products are Century and Cardinal, Amerimax is a mediocre brand at best. On the other hand the best product with a poor installation is not going to produce the desirable finished product either. That being said the local Lowes and Kohler distributor both recommend people to our shop almost daily for both product and installation which in my opinion states a hell of a lot about the products they sell. And i say this same thing for windows, doors, and most all building products DO NOT buy them from HD, Lowes or any big box store. This is only my opinion but I am a strong believer in this as I have seen and heard to many horror stories over the years and personally know too many unhappy people who went and used them for products and or installation. It is a crap soot whether or not you will find somebody capable of tying their shoes correctly let alone do your construction work correctly.

If you are not set on shower doors why not do a ceiling mounted shower track for a curtain? I just did one in my walk in shower and I LOVE it. Makes the shower look huge. You can have the curtain go all the way to the ceiling or use chains between the track and curtain (this is what I did). I tried to put the link below to the photo I saw initially, here is the address to the company who sells them: www.ceilingshowerrod.com Here is a link that might be useful: [Houzz[(https://www.houzz.com/photos/riverside-drive-super-groovy-masterpiece-contemporary-bathroom-new-york-phvw-vp~2456534)

Hi, I'm not sure if you will find something that will work, but here is a good site for Barn door hardware and other components that might work for your needs. Richelieu Specifically, bypass for heavy doors

As long as you get a similar style frame you should be ok. The only screws which go into the tile are in the side rails; there should be no screws going into the curb (or bathtub). The screws you might be seeing by the bottom rail are probably the ones for the divider piece, but those go into the bottom rail not the shower curb. You will have lots of caulk or silicone to clean off, but even if the holes are in different places the side rails should cover them. remove the doors, lift off the top rail, unscrew the side rails and carefully pry up the bottom rail. Clean surfaces thoroughly and follow directions to install your new shower doors. If you need to drill new holes into tile, remember to break the surface of the tile with an awl before you drill. You might need to cut top and bottom rails to fit, but a hacksaw will work fine. Silicone lots of places.