Steyr diopter, barrel extension etc for a LG110 FT

[XTX]

I have recently acquired a Steyr LG110 FT that was set up for 10m competition shooting and I have no need for the diopter, front sight, barrel extension and sight risers etc.
The diopter is Steyr branded, so I assume the rest is genuine Steyr and as far as I know it was bought from Steyr UK.

Where would be the best place to sell the parts and any idea what they are worth second hand?
I have only been able to find something on German websites and the diopter on it's own is 140 Euros http://www.euroshooting.eu/en/index....yr&detail=2924
This looks like the kit but the one I have has a black extension tube with a silver end, it does not have STABILIZER written on it though http://www.euroshooting.eu/en/index....ET&detail=2968

Obviously I would like to sell it for as much as possible because the rifle + kit was a lot of money and I would like to try and soften the blown (and save my marriage )

[XTX]

Somebody must know something bout these bits?