I've had a look on ebay at 106 ones, the 1.5 diesel one looks to have the reservoir on the end of a hose like this:
http://www.ebay.co.uk/itm/181279348760?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
Whereas others look to have it incorporated on the pump like this:
http://www.ebay.co.uk/itm/PEUGEOT-106-ELECTRIC-POWER-STEERING-PUMP-1996-2004-FREE-DELIVERY-/261341023936?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3cd9238ec0
I'm sure i've seen this style used a couple of times on other 306's but wondered why i hadn't seen the diesel style one before.
Any advice welcomed, i'm ditching my pas pump to make space for something else, so will be putting the standard alternator back on to cope with the extra current draw.
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Goldie the track car.