I also wanted an improved, minimal sight. I thought the lyman/williams sigths were still a little bulky. I ordered one of these for my pre 64 30/30
http://oneraggedhole.com/
It said that they fit "all" winchester levers. All you have to do is unscrew and remove the rear buckhorn site and this rear site just slides over the remaining part. However, I could not for the life of me get it installed on my rifle. I wrote them back and asked and how to install it. Alas, it does not fit on pre 64's. But if it would work, I think it would be great.