Gun Parts Corporation carry Winchester Model 69 and 69A parts, including sight hoods and new-made magazines.
http://www.e-gunparts.com/products.a...l=0950z69A&MC=
The rear peep was probably a Redfield or Williams receiver sight.
If the base is still on the gun it may have the makers name on it, or on the back side.
If not, Brownell's sell both Williams and Redfield receiver sights:
http://www.brownells.com