Cam chain tensioner pads from Hamburg Technic?
 

I just noticed these on the Pelican site (pelican calls them Porsche Guide Rail Set Part#: 996-105-253-00-HBT)
They are less than half the price of the Porsche part. I am suspicious of cut rate parts, especially for a rather critical part like these pads, but could this be one of those cases where it is the same part from the same manufacturer but without the Porsche name?
By the way there is also a kit from HT with 4 pads to do both heads and it costs three times the price of the pads to do one head!
Just curious, I have to order pads soon.

Considering what a project replacing the chain rails is, there is no way I would scrimp on the replacement parts. We exclusively use LN Engineering replacements and have never had any problems.

I just did the rails and chains, all with OEM Porsche parts (which it looks like LN is selling). I read online somewhere that the newer revision of 996-105-253-xx doesn't come with the O ring and appear to fit looser than the old ones. Mine were definitely tight and came with O rings. Check with your local Porsche dealer, if you have a PCA membership they may offer a discount and the cost may be less in CAD than what you see in USD from various sites, mine were. I've paid for my PCA membership twice over already with the savings from dealer parts.