Thinking about picking up a pair of oakley radars or radarlocks. Few questions for the knowledgeable. Besides the switching mechanism in the radarlock are there any visual differences between the radar and the radarlock? I'm not a cyclist these would be more for running, do they make a male straight stem/arm version? Do they make a straight stem with the path lens(leaning towards that cut)? What's the biggest lens to smallest lens? Thanks in advance for any info and or suggestions.