AFAIK, Weaver bases are only of the later/inline type that fit later BB94's and all other 94AE's.
IIRC, the only place to obtain those early BB94AE bases, which have a front base with the straddle screw holes, is directly from Winchester.
Have you called their Parts Dept ? If they don't have them in stock any more, perhaps they can direct you to another source.
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