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@Gregt44 wrote:

I bought a Kensington N17 combination locking cable for my R11. It will simply slide in and out of the slot. I am looking for the proper lock for this computer

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If you are asking where to attach the lock, that would be #11

Lock attaches at Number 11

If you are asking what Kensington lock will work--

As the Kensington N17 is listed for use with laptops, you may need to order--

Kensington Desktop and Peripherals Locking Kit

Manufacturer Part K64615US | Dell Part A3609721 | Order Code A3609721

After a second look, the N17 uses a standard 5mm keying system; so it should work in your R11.

Not sure why it would not?

A little more digging shows 3 different engagement types--Wedge, Kensington T-Bar and Non-Standard Security Slot Anchor.  It appears that Dell uses the Wedge...but who knows, it's Dell, they may use the T-Bar on the desktops.

At this point I don't want to do any more digging. 

Nothing is ever simple

Did the A3609721 Locking Kit work?  I was sold both an N17 and Click-safe Wedge type lock by Dell and neither work on Desktops.  They work on Laptops.