those wont fit. too small. Take the o-ring off the grove in stock ans use that. OR take it to a Home Depot or Lowes and find a similar sized O-ring. Dont get an extremely thick one or the hammer wont have room to move all the way back and engage the sear. As an alternative you can buy a flat neoprene/rubber washer of the same size and place it in. Also sold at hardware stores. At home Depot and Lowes these are kept in the drawers for the specialty bolts and screws.

prob solved! thx

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glad I could be of service.