Early Macedonian Hetairoi gear

[Merlkir]

OK, now I'm confused
The heavy variant with a breastplate (tube and yoke more probably?) and a helmet is more likely? And for weapons - a lance? Or just a spear? maybe a sword for a sidearm?
And if I understand you, there could be some kind of lighter cavalry - the grooms?
For the helmet, I've found these coins:


[url:3mq9oitl]http://www.wildwinds.com/coins/greece/macedonia/kings/perdikkas_II/Raymond_175.jpg[/url]

[url:3mq9oitl]http://www.wildwinds.com/coins/greece/macedonia/kings/perdikkas_II/Raymond_131ff.jpg[/url]

although I don't know if these would be appropriate. And I can't quite tell what kind of a helmet it is anyway. Are the cheekguards fixed, or hinged? It reminds me of illyrian helmets a bit.
(I think the coins are from the reign of Perdikkas II, that should fit the timeframe)

(I apologize for so many question, but I find this subject very interesting.)