Not sure what engines they're used in, but if you download Max Power Catalog and look in Spare Parts section for .12 engine (page 2), you'll notice all their part numbers match novarossi's except they have "MX" in front of it...
Edit: #28607 head button is used in 12LS3 engine...
i think we are all on the same page so the Ls3 will work
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