safety glasses questions.

hello. I lost one of my side shields for my perscription safety
glasses.

COI z87.1 and SAFT 105 L are the numbers written on it. the store wants
15 dollars for replacements. I was wondering would any of the side
guards from www.safetyglassesusa.com fit my glasses?

Are these types of side guards adequete for mowing the lawn and yard
work? I rarely see people using any type of safety wear for yard work
but if they only knew what could happen.

I have tried over googles from the store but they just fog up so I
can't see. Do the over glasses work any better? I would like a nice
pair of over glasses and to replace my side guard. wearing googles
while mowing the lawn sort of makes me look like a alien life form.

thanks