SVO6
You need 2 x 173.5mm in length each to fill each groove (a ~1mm gap will remain). Scale the length if you need to.
SV06 Plus
I'm told by user @ThomasAlbrecht that to cover both extrusions fully, you need 4 x 223mm.
SV06 Plus ACE
I'm told by user @DerekPeace_3426212 that you need 234mm pieces, so, you need 4 x 234mm. Please take a measurement of the gap before printing to see if these figures make sense. I don't own this printer.
Details
These do not snap into the grooves, they're only meant to keep gunk out of them. If you want the snapping kind, print C6x100mm flat seal PVC black.3mf instead, and scale it to a length of 173.5mm (x2 pieces). Note, this is the original piece from Sovol, I simply exported it to .3mf.
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The author marked this model as their own original creation.