looking for winchester model 70 rear sight

Hello,

I am looking for a rear sight assembly for my winchester model 70 rifle. This version of the rear sight came on the ranger series and short action carbine series of rifles.

There is a great picture in this listing:

http://www.GunBroker.com/Auction/ViewItem.aspx?Item=370623310

Does anyone know where I can fing one of these?

The rear sight leaf folds down

Thanks,

JD