help to find some spare parts

[iowtheme]

HI All New to the Forum

Looking for some help
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Think this is a Mushroom lock?



I am looking for these to buy but i do not know what they are called



List below is a number in red that is stamped on the item





I am looking to revamp our windows as they are approx 15 years old now and parts are getting worn


Thanks All
:?: