I agree completely with your comments on the 4 x 50kg ...
on the e-Bay Hs 126, and I could easily be wrong about the racks on the scanned a/c on Page 1 of this thread. The SD2 and 4 x 50kg racks could both be attached to the same bomb release mechanism, usually an ETC 500 or ETC 501.
All the best,
George
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