KYB catalogue is here (19mb).
http://www.kyb-europe.com/pdf/KYB_Catalog_2012.pdf Subaru is page 257.
Part numbers for Bugeye WRX:
Standard Excel-G shock
Front Left: 334305
Front Right: 334304
Rear Left: 334307
Rear Right: 334306
Uprated Ultra-SR shocks
Front Left: 324027
Front Right: 324026
Rear Left: 324029
Rear Right: 324028
Please check the catalogue tho, i've just copied the part numbers out and take no responsibility for typos

Then go here to buy if you need to get them yourself:
http://camskill.co.uk/m32b0s0p0/Kaya..._Product_Range (phone them for a bundle price if you're getting all 4)
Looking at about £80 a shock for the standard Excel-G, £100 a shock for Ultra SR. When i was looking I asked Gatwick Subaru for a price, was a tad more
I guess you're mechanic will source any patent part from the local auto factors, I decided to buy the parts i wanted then just pay for fitting. Means you can add springs as well, make it handle better