I've spent quite a bit of time looking for low profile right/left angle c13 connectors and I haven't found anything other than what you see from Lian-Li. Lian-Li most likely has them special made. If you need just 1 cord then you can get one from ncase in their accessory section.
My gripe with this PSU is that the c14 connector is oriented upside down compared to the Silverstone SFX's. Perhaps it's an oversight on their end but it's actually annoying.
This is the one but it's not as low profile as I first thought. It's 39mm tall which is 4mm shorter than the ones available on digikey. Still nothing compared to the 28mm tall NCASE one.
I was looking into low profile c13 connectors the other day and was able to find one company who made a fairly low profile connector but it appeared to only be custom order. The lowest profile c13 connector I've seen is the one used in the NCASE M1. Check out this post here if you haven't seen...
Your best bet is the AXP-140. Largest heatsink that will fit. That or go with an all-in-one cooler like the H60.
Here's a build log of someone who used one.
The Zotac z68 actually has more room between the mounting holes and pci-e slot than other boards with that same layout.
Here's an image to show you what I mean.
Looks like there's about 1 or 2 more millimeters of space :) I wonder if this allows the use of some other coolers that were...