Lunati camshaft keyway/woodruff key?

OK, getting back into building engines after a way long break, I go and get myself a Lunati Hyd. Roller cam for the wife's new toy. ('67 Cuda)
I started with a non Magnum roller 360 block.

The cam is part number 20200711, grind VDSC-270,
271-279, (@.050 219-227) - .515/.530 on a 112.

Now here is th issue, the standard MP woodruff key is to long. The snout of the cam is shorter than a LA cam I have laying around. I figured my machinist might have the key for the cam, but he did not and couldn't find one via his phone, books and the quick net search.

The key size is .520 long by 3/16 wide (or .1875 wide.) not to sure of the exact height since I had the cam but not the gear.

Anybody have an issue like this?

Would this short snout be a Magnum short snout cam?
Would a Magnum woodruff key work.
(Dealer part number, 6029411 for a 5.9 Magnum engine.)
Dealer told me they can not get them.
(Hate this dealer in particular.)