V8 Rocker cover ht lead clip thread size

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On the rover v8 (chim griff etc) there are holes in the top to hold ht lead retaining clips.

Anyone know what thread size they are
Fyi they are bigger than 4mm and smaller than 5mm.

I suspect they are imperial 3/16 unf but just guessing.

Why do I ask. I want to tidy up my ht leads using some chromed clips I have so what to buy some suitable set screws to hold them in place.

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Thanks fellas unfortunately self tapers wont work with the clips I have as they are two piece and defo need nuts and bolts to hold them together.

So, still really need to find what threads are.

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Interesting. Mine have threads. Will take a closer look tomorrow in daylight.