Ash Lip bolt size?

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firebox115

New Member
Sep 5, 2019
27
USA
I have a Pacific Energy wood stove insert that is missing 2 bolts that hold the ash lip on. I tried a M6x20mmx1.0 pitch and it was really close, but not quite. 1/4-20 and 1/4x28 were not as good of a fit. Maybe M6 with 1.25 pitch? The manual doesn't say anything except to order a new hardware kit. Any ideas? thanks
 
I know the bolt head is 3/8". I pulled out another bolt on the insert with a 3/8" head and it was a self-tapping.