Usually you pull the grease cap off, then the magnet will stick to the flat machined surface of the front wheel hub.
Going to have to pull the center cap off your Cragars.
Ultimately 2 stock steel rims with matching tires will be your best bet for clearance to the hub.
Also if your Cragars have an offset to them, that will make it more difficult to set the Camber and the 20° to 20° degree swing needed to determine the Caster.
Offset rims will put more leverage on all the front alignment parts, throwing off what the actual stock recommended settings should be.
Beg, borrow, or steal a stock set of rims and tires. Do the alignment including the Toe In, then put the Cragars back on after all done.
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