2002 ford explorer timing chain tensioner?

I want to replace my timing chain tensioner on my 2002 ford explorer sport 4.0 4wd.
and i was wondering, i want to buy the part off of ebay and i wanted to see which brand is better,
Aftermarket OE Replacement Part or engine pro brand, the reason i want to get it for ebay is because at the stores it cost close to 75 for one. Here are the links of the items. And will these ware out faster then buying the ones from the actual store-stores sell OEM standard grade. So i'm trying to find out if i should get the engine pro or the Aftermarket OE Replacement Part brand… And will they brake faster then the original OEM standard grade ones you get from like actual stores like autozone and stuff like that?

Engine pro- http://www.ebay.com/...1028325338

Aftermarket one- http://www.ebay.com/...1251430976

Hi so if you think you could do this job on the cheap. Think again as it will come back to bite you later sunshine. Only a Ford dealer can do this without it stopping you by not allowing it. LIMP HOME mode and not starting at all are just two of the things this Ford computer has install for you.

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