Does anyone one know the size and pitch for the trans bracket to frame bolts? I found the master bolt size sheet and did not see them on there.
OEM part number 9978-01-025 - the 4 bolts that mount the bracket to the tunnel.

 

If I had to guess they would be like 12x1.25 about 40mm,maybe 50.
I know they have a light cone shaped end,so I am assuming they would be "special thread".Maybe the type that doesn't back out easy.
You have sufficient posts to pose this question in SEC GEN Specific where there is a lot more traffic.
IF you want me to move the post just PM me.

 

IIRC, they are M10x1.5. I am not 100% certain of this, as they MAY be M10x1.25. Gut feeling says M10x1.5 though Fortunately, bolts are cheap enough at your local Lowes/Menards to get both for a few dollars. The tapered head on the stock ones doesn't really affect how they hold, just makes them a little easier to thread in.

My car has both the stock JIS hardware with a 14mm hex and a couple regular DIN bolts with 17mm hex heads. M12 has a 19mm hex

Once you get the correct ones identified, please post back and we'll add it it the big hardware FAQ you referenced.

 

Ya,I am thinking M10 now as the difference is 4 when putting a wrench on the bolt.
(M10 use 14 mm wrench.so on).
I'd just grab the Mazda bolts really.If you know they are correct,why sweat it?
You can always measure that actual bolt and post the info.Right?

 

Thank You! ive had the mazda bolts on special order since last week, But they came across some troubles and offered to refund my money so i thought id see if i could find the bolts at a hardware store. Appreciate the advice! I figured i might as well just wait for the oem bolts, get it right the first time c:

 

get it right the First time.Yep..Do it once,done,save work,sit back drink beer.Look at it and admire the work.Brag to your buddies..lol!

My Dad(rest his soul) always said to me:
"There's a difference between scratchin yer *** and tearing it all to pieces!"

Thanks Dad...I think??