Need help finding wiper arm mounting nut. 2008 GP Base

[milagrofrost]

We had a 2008 GP sitting at the barn for a few years and at some point the wiper arm nuts were removed. Fast forward to now, car's all fixed up and the last thing it needs are the wiper arm mounting nuts.

GM parts says the part number is 11589150, but we got that in and it's too small! http://www.gmpartsdirect.com/pontiac...&position=left

Does anyone know the size nut the wipers need?

[CHI2000GTP]

That's something you go to the junkyard for. Any of those around?

[coolone]

I'm sure the local GM dealer could order it if you have the part #... Or a JY works too.

[milagrofrost]

That's something you go to the junkyard for. Any of those around?

Yeah that's an option. It's not as convenient as going to the hardware store with the correct nut specs. But looks like it's going that way.

I'm sure the local GM dealer could order it if you have the part #... Or a JY works too.

That's how I ended up here. GM dealer said #11589150 was the one we needed, but was too small. But junkyard seems to be the sure shot.

[coolone]

I have a parts car sitting there, if you can't find it local let me know...