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I could not get my hands on the OEM plug (NGK BPR6HS) so I looked up some others.
Autolite 4123 (I bought this one at my local Autozone for under $2) It works fine.
Here is a list I compiled by searching manufacturers web sites.
Autolite
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4123 (easy to get)
275
Bosch
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WR6BC
WR7BC
WR7B
WR7BP
Champion
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RL82Y
RL82YC
RL82YCC
RL87YC
L87YC
QL82YC