M4 x 15mm Jack Nuts / Spyder Split Body Rivet Nuts (PL4)

Hello, I'm in need of a single or possibly a couple of M4 x 15mm, or shorter, Jack nuts.
I've also seen them listed under various names, including Spyder split body rivet nuts.

If anyone has any they're happy to let me have, I would be most grateful.

I'm in the PL4 Greenbank area and can travel a certain distance to collect them if needed.

Thanks.
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