Alloy Mainspring for Rolex caliber 3135

Non-Genuine Swiss Mainspring for Rolex caliber 3135 movements plus perhaps others as well (pretty sure the 3130), white alloy, new in sealed package.  See images for precise mainspring specifications. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.