For size fittings...
12/16 hose = 13mm Lily Pipes
16/22 hose = 17mm Lily pipes
Just get the lily pipe size which match your hose size.
Glass lily pipes of various designs are available at most good LFS... the nicer/higher quality ones are usually sold at LFS that specialize in aquascaping, places like Green Chapter, Fishy Business, East Ocean, Aquatic Ave etc. It'll be good to visit those LFS to compare the designs and quality.
eBay is a good source for lily pipes too, but you do have to consider that all these are handmade items so there are differences in their quality and manufacture amongst individual pieces. Even when buying from LFS, you also have to check the individual sets for scratches, dents or cracks before purchase. So ordering them online has a certain measure of risk since you cannot check and select the good ones.
Btw, if you are not too confident with handling delicate glassware, there are now also acrylic versions too (much easier to handle), you can check out my review on them:
http://www.aquaticquotient.com/forum...-Lily-Pipe-Set
As for skimmer intake versions, the common ones available use a glass intake pipe with floating acrylic skimmer head, those do work quite well too. You just have to adjust the flow so that it is balanced between the skimmer and intake units.
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