Swaro Habicht binos

[BigPig]

I have an opportunity to pick up some older Swaro Habicht 8x56 binos from a widow neighbor. Her husband had them and from the looks of them never used them much. I'm not exactly sure how old they are. The only thing is, I have no use for an 8x56 bino. If I'm going to pack around big glass, I want 15's. So how much would be a fair price to offer for them in their current state and does anyone know if I could send them back to Swaro to have 15X lenses put in? Thanks,