I think you're a little confused.

There is an oil feed pipe, that goes into the top of the turbo, and an oil return from the bottom of the turbo that goes into the sump. The 2 ebay links are both for the oil feed to the turbo. The link for the hose is a 2wd specification oil feed, which fits onto the adaptor near the starter motor along with the oil pressure switch (like this : http://cgi.ebay.co.uk/Ford-Cosworth-Engine-Escort-RS-Turbo-Oil-Feed-Adaptor-/310305509372?pt=UK_CarsParts_Vehicles_CarParts_SM& hash=item483fa64ffc). The 4x4 specification turbo oil feed instead comes from the side of the cylinder head.

You can either :
1. buy a standard 4x4 oil feed hose, and not fit the adaptor into the block above the starter motor as used on 2wd vehicles, and screw the oil pressure switch straight into the block, or
2. blank off the turbo oil feed in the side of the 4x4 cylinder head, and use a standard 2wd spec oil feed hose (as per your ebay link) and use the standard 2wd adaptor in the side of the block above the starter motor (into which the oil pressure switch will screw).

Whichever option you choose, the "GrpA turbo oil feed" from the ebay link is no good to you - it won't fit with standard hoses. If you want to use it, you'll have to make up your own hoses. What you will need to allow you to use standard hoses is one of these in the top of your turbo, if you haven't already got one :
http://cgi.ebay.co.uk/Escort-Rs-Turbo-inc-Cosworth-T3-Oil-Feed-Turbo-Union-/140445678579?pt=UK_CarsParts_Vehicles_CarParts_SM& hash=item20b336fbf3

The metal pipes that fit onto the sides of the turbo (using banjo bolts) are for water cooling. The one closest the the head is the feed, which comes from the thermostat housing, The one furthest from the head is the return, which goes back to the header tank.