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i just got myself a set of 15 inch rota slipstreams (wrapped in falken ziex 512's) and i want to get some mcgard wheel locks just to be on the safe side.

i did search and know that i have to get the 12 x 1.5 size wheel locks but do i get shank style wheel locks or the cone seat wheel locks? will both fit on my car? what's the difference between em?

also, do i get the 3/4 in. hex or the 13/16 in. hex? with regard to the cone seat wheel locks?

last question (i promise ), i'm sure that i don't have to jack up my car and take off the whole wheel to put on the lock, i can just take off one lug and put the lock on right?

thanks for the help guys

 
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I've got 3/4" locks (at least thats what the key diameter is). They fit fine. You need to get the lock that matches the seat in the wheel. If you've got conical lugnuts, then you need a 3/4" conical seat lock with the 12x1.5 thread. You should be able to just undo a lugnut and put the lock on. Just make sure that you torque the lock on evenly with the rest of the nuts.
I can check the Mcgard part number later... I need to find my reciept for them.

 
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if you could find the part #, that'd be a great help. thanks boilermaker1!

 
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Tire Rack part number 24137... $27.95
They're actually 19mm locks (.748"), but whatever.
I don't know if thats a McGard number, but thats what shows up on my Tire Rack recept.