Stair gate locking parts (PL4 Greenbank)

Hello I've got a stair gate but it's missing the two parts shown in the included photos.

They're the parts which the stair gate locks into if anyone has any of these which they no longer need and happy to let me have I'd be lost appreciative as it seems purchasing a new set isn't much than the cost of a whole new stair gate.

My postcode is PL48PE.
Can you help with this request?
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