Hi
I have now got three sets of the Jawbones in various colours. One pair is from DX and the other two are from China based eBay sellers. I can confirm there are definately two models of Fakley Jawbone that are slightly different in size.
My DX ones and a pair of the ebay ones have very slightly smaller lenses. The other set from eBay have the slightly larger lense. Also the jaws are not interchangable between the two different models. Visually you can’t see the difference however. The only slight difference is the smaller lens have a stamped model number on the inside of the left leg 04-211 62 18 or simiar.
I think the smaller lens models won’t take a genuine lense without some filing of the lense going by some of the previous posts. Will ask a mate who has genuine glasses to see if the genuine lense fits in the larger lense size models.
For info the eBay ones do arrive a bit quicker, about two weeks. Also noticing quite a few probably less than genuine one bein sold as genuine on eBay!
Regards