Rear Main Seal

[icanfixall]

This is half price if you buy from international and probably 1/3 the price from ford. This has the new double lip synthetic rubber or teflon material and the speedi sleeve.
http://www.ebay.com/itm/NOS-FORD-F2...Parts_Accessories&hash=item5d4f4f9387&vxp=mtr

 

[Ruger_556]

I really dislike installing those...

edit: Rear main seals that is, nothing special against this one.