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Ebay is a source for HMMWV parts. Like Glow plugs.
Do a search under M998 for example.
If you don't like Ebay You could always try Kascar but you will pay more.
You may also try The Hummer Parts Guy.
He is in most cases cheaper then Kascar and your order will be drop shipped to you straight...
You may or may not need the tool. If the ends of the plugs have swelled then you stand a chance of needing the tool. If you have non swelling glow plug's in it now then there is a good chance you won't need it.
I would also suggest using some hi temp anti sieze on them when you put in the new...