Thermochill PA120.3 Barbs?

Are these the correct barbs for my rad? I'm using 1/2in. ID 3/4in. OD tubing. http://www.frozencpu.com/products/2...Plastic_Radiator_Barbs_-_Pair.html?tl=g30c101

Or is it better to use the metal ones (same size)?
http://www.petrastechshop.com/aqhifig3th1o.html

well fromt he site metal is cheaper and i say metal all the way, i will be replacing all the pastic barbs on my setup when i get it all with metal barbs.

Defiantly get the metal barbs. The plastic ones suck.

Found the answer to my own question (probably should have looked harder).

Basically you can't find very many places that sell/make 3/8 - 1/2 barbs so you have to buy an adapter. Go to http://www.mcmaster.com and type 4860K657 into the search box, it'll bring up "Brass Threaded Pipe Fitting Nickl-Pltd, 3/8" BSPP Male X1/4" BSPP Fem, Hex Bushing"
[In stock at $4.74 Each]

After that you'll be able to use standard 1/4 - 1/2 barbs such as these Switftech ones http://www.frozencpu.com/products/5...ings_-_2-pack_BSPP-250-500-CP.html?tl=g30c101

Hope that helps anyone else who is having trouble finding barbs!