Its for the one on the top that is not used. The bolt that took me ages to find popped off today while driving and I need to put one on it ASAP. I do not have another car so I can't be driving all over to different stores to find one that fits. The first time I tried looking for it OSH and Home Depot did not have ones that fit, along with Autozone and Lowes. If anyone has an extra one that they could give me it would be MUCH appreciated!

Its this one (although mine is a Crucial downpipe not HKS):

 

Ace Hardware has metric bolts.

 

I dunno if there's a Dale's Hardware near you, but they usually have a decent amount of different sized bolts. If you know the pitch and length, you can just call around.

 

wont a sparkplug fill that hole until you can find a new one? this time, buy a " O2 bung plug" TIA

 

this happened to my friend.. im pretty sure he posted on i-club too.. he was able to find a bolt that perfectly fit the bung.. try searching for the thread. his username is thebatmang.

 

He has not signed in for months so I do not know where he got his from.

Also I tried putting in a spark plug before and it did not fit, does it have to be a Subaru STi spark plug? And since I can't really go and go out to Ace and all that to look for bolts that they might not have does anyone have one lying around at home?

 

if youre not lazy you CAN pull the downpipe off and take it to a hardware store to find the correct bolt

 

O2 sensor should be an M18x1.5 bolt (18mm, 1.5 thread pitch)

 

thanks, that will help alot when i go looking for one since i didnt know the exact specs! hopefully i can go today during my lunch break if anyone lets me borrow their car which probably wont happen

 

I work at a fastener store and i can't find that spec. Is it a 2.5 thread pitch? and what is the excact length?

this is what i found
http://www.fastenal.com/web/products...l.ex?sku=38796 for regular steel
http://www.fastenal.com/web/products...82730035A20000 for stainless steel

If you want i'll order some from my hub and ship it to you...
(note in-stock means in my hubs not necessarily at my store)

 

http://store.summitracing.com/partde...5&autoview=sku

 

Might also try Kragen/Pep Boys for K&N stuff like : http://www.knfilters.com/search/prod...?Prod=85-21686

 

18mm oil pan drain bolt will work as well