In my opinion spacers are a waste of time, money and when used with anything other then light street driving can be dangerous... 15mm spacers are just daft and you will want new extended bolts.
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The thinner ones on the bottom are basic spacers - no studs in them. You typically don't need to install extended studs for anything 5mm or less. For anything larger than 5mm you will want to install extended studs.
The ones on the top have studs built in them. This allows you to run a wide spacer without needing to install extended studs. You bolt this spacer on your hub, then trim your factory studs down with an angle grinder or some cut off tool. The studs can't stick out any further than the spacer or your wheel will not sit properly.
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It isn't mentioned but either way you go you want the hub bore size to match your perfectly, in the case of a 2002 WRX a quick google search found 56.1mm.
TL;DR - Save your $$$ now and buy wheels that fit. If you are set on spacers then do you research on the manufacturer, material / metal used and user reviews so you don't end up like this
