Thanks to Bob Bogart, mirrors are available from the link below:

Be sure to select the Seniors on Bikes bottle cap from the drop down and also the mounting type.

We have created a custom SOB bottle cap rear view mirror in conjunction with Flatlanders Mirrors. There are 2 types, eyeglass and helmet mount.

The Flatlander Bicycle Rear View Mirror is made in 2 types, Helmet and Sunglass Models. When properly adjusted, a simple twist of the head from 10 to 15 degrees is all that is necessary to see what is behind you. The Helmet Model is lightweight, has a high quality mirror, and is made from a 14 straight gauge bicycle spoke so it will mount securely, offer good visibility, and not vibrate. It is well suited for people with prescription eyewear, especially those with lightweight glasses or if you have a pair of expensive sunglasses such as certain Oakley’s that can have exotic temples. Using the Helmet mirror, you are not limited to which pair of glasses you wear, you can even go without glasses for those long slow up hill climbs in summer when the sweat just pours from your eyes. The Helmet mirror comes in 2 mounting sizes, Standard and Large. The Standard size fits most helmets sold in Bike shops that have a rim width up to 1 1/4 inches or 31.75mm wide. The Large size will fit helmets that have rims that measure up to 1 1/2 inches or 38.1mm wide. Before ordering a helmet mirror please check your helmet rim for the width.
The Sunglass Model has a high quality mirror, made from a 15 straight gauge spoke so it is lightweight, will mount securely, and offer good visibility. The sunglass model was designed to fit 90% of sunglasses made today. The ideal glasses are ones that have a rectangular temple. Some Oakley’s or other models with fancy temples may have issues. The Sunglass model comes in Left and Right Hand styles. The normal is the Left Hand Style which places the mirror on the left or traffic side of the glasses. If you live in an area where the cars drive in the left lane, your right is dominant, or you have lost the sight of your left eye choose Sunglass Right Hand and I will make the mount to fit the right side of your sunglasses.

One advantage the sunglass model has over the helmet mount is if you have the helmet mirror set for warm weather riding and is gets cool enough to wear a cap or balaclava under the helmet, the helmet mirror won’t give you the same view behind as it did before, so you may have to readjust it. Or buy 2! You can never have enough…

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