Looking for a 50mm Fan to install on a Socket G2 cooler

[AshleyAshes]

Yeah, I know, 'WTF is Socket G2!?' it's well, Intel's PGA socket for laptop Sandy and Ivy Bridge, because I'm building a desktop out of laptop parts, I'll link to that later.

But anyway, this is an oddball socket with no true standard for HSFs and my options for what I can use are somewhat limited.  I eBayed myself a non-name cooler which does MUCH better than the 'OEM' CoolerMaster one that is standard with the Socket G2 motherboard I'm using but it has a stupid fan recessed into it and I'd like to replace it with a 50mm fan that can cover the whole top.

 

The HSF on the left is the no-name cooler I picked up, works a lot better than the one on the right, but if you look you can see offset holes atop it that are 50mm apart that would allow me to put a much bigger and likely quieter fan atop it.  The recessed fan is just held in with two screws and easily removed.  I was thinking Noctua but lo, their family of products jumps from 40mm to 60mm, skipping 50mm.  So I'm looking for suggestions on a 50mm can that I could screw atop this, something capable of cooling a 45w TDP i7 2630qm at that but maybe not needing all 5000 RPM that the recessed fan requires.   In short, small IT fans are really not my area of knowledge and I'm dreading buying something that sounds like a dustbuster at full speed.

 

 

 

And if you wanna see how I'm turning a laptop into a desktop, check it out here:

 

 

[emosun]

protip

if you use zipties you can use any size fan you want. my cpu fans are zip tied to my 1366 coolers

reason i say this is bigger fans make less noise

[RadiatingLight]

custom watercooling loop + zipties.

/s

 

but really, use zipties. 

[RGProductions]

i might have a 50mm fan

not that I can ship it RIP

[AshleyAshes]

Oh, oops, I don't actually need a 50mm fan, I need a fan who's mounting is 50mm apart.  The Noctua 60mm fans, their mounting holes are at 50mm, so they're perfect.  My bad.