You will need a thread pitch tool to decide what thread pitch these have. Especially in metric, it is easy to get the correct diameter....and the wrong pitch!. While that is a flange head fastener, a regular fastener with a proper washer under the head will work fine.
The problem is...that metric fasteners are still fairly hard to find in any numbers at most hardware stores. Auto part stores might have them, or a kit with one in it.
Yeah, I would just pop it out and take it to lowes for comparison. It will obviously be metric, and you can check the nuts section first to find the matching thread. I think those are either 6 or 4mm, I can't remember the pitch.
If you have a duplicate bolt, just remove it and take it to the hardware store. Most have what I call a 'fitment board' where you can fit the bolt. When you have a match, the board displays the bolt info. Good Luck
If you also own a Yamaha dirt bike within the past 17 yrs or so, (or have a buddy who owns), see if you can get lucky and match your fastener up with a Yamaha fastener. Suzuki uses really crappy screws in some places, whereas the Yamaha screws are much better. Taller head height and just overall more sturdy construction, and as a bonus, the Yamaha part usually is less expensive too. A good example of this, are the screws which clamp the front axles on my '18 DL1000XT. Any of you guys who have worked on both brand bikes will know exactly what I'm talking about.
I would not suggest stainless steel. SS is not as strong and has a tendency to seize. Unless corrosion is a concern, use a normal zinc plated high strength steel fastener. And if you do need a SS fastener, try to use a type 316 SS as these are stronger.
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