The Baggies left-back was part of the Blues side who beat Arsenal with a dramatic late winner at Wembley .
"The big one for me was beating Arsenal at Wembley, but Saturday was definitely up there - maybe not the same, but definitely up there," said Ridgewell.
"I had never had a point there, so to go and win at Old Trafford was brilliant.
"I think last year was the closest I've come to getting anything from Old Trafford before. We lost 2-0 but we played very well that day.
"We spoke about it before Saturday's game and said we'd played really well last year and not got anything out of it.
"On Saturday we did. It is brilliant."
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