Close-up Finder Set for Fujica GS645

I am a GS645S user. A friend offers me a "Close-up Finder Set for

Fujica GS645". How is the quality? Is it adaptable to my GS645S? Is

there similar close-up set for my GS645S?

The set consists of a close-up finder and a close up lens. I am

planning to buy a 49mm screw close up lens with the same

magnification of the original one and then use it with the close-up

finder. Will I get correct focus and field? Does anyone know what is

the magnification of the close up lens? (I can't find it from the

manual.) Thanks.