Those things were like impossible to find despite being so easily broken. And I unfortunately don't have a source. (I actually just went without them after they were broken. Serious PITA to get the wheel remounted accurately.)

Do you have an R/C car shop in your area. They might be able to help. I have gotten odd screws from them in the past.

It's an M3 screw, pretty standard stuff. Original is a phillips dome head, 13mm long, but there's no reason you can't replace that with an internal hex head style, which you should find in most boxed screw assortments. You might have to cut a longer screw down, but that's pretty easy to do with an M3.

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

A fix that a former Cervelo PM shared with me is to tap for a m4.

Thank you for the detailed size

I just ordered these

I’ll post when I get them if they work or not

13mm Long M3x10mm Stainless Steel Hex Socket Head Cap Screws 100 Pcs https://a.co/d/5JblTW2

Just fwiw, those are M3x10mm, which is a tiny bit shorter than the stock ones, although you'll get a wee bit back from the hex head. Likely not a problem, just letting you know.

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

https://www.mcmaster.com/...r-head-type~rounded/

I had to replace mine on a NP3, and I was pretty surprised to find a pretty close match length/diameter/etc wise at a local Ace's Hardware.

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Next races on the schedule: none at the moment

Thank you fort our post

I think they are 13mm long

It seems The hex HED is 10mm

You think?

The amazon screws are 13mm oal, but the threaded portion is 10mm. The screws on a P3 (at least the ones I measured - I keep these in a notebook, because I'm a nerd) have a 13mm long shaft.

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Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/

Nothing to add that you do not already know. But I had not idea what an m3 screw was before I replaced mine on my P2. Now I have about 10 extra because I could only buy in bulk on Amazon.
But I did have my choice of colors. And getting g that stripped bolt out was a pain in the A$$$.

Good luck

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2017 Cervelo P2
2017 Cervelo S2
itraininla.com
#itraininla

... and you know what to put on a screw/bolt to keep it from seizing up? That's right, Never-Seez !!