Micra Lambda Sensor Thread Collar?

Hey MSC,

This is my first post - I am the new owner of L139 NBW / 'Mark's 1.0L' : https://www.micra.org.uk/threads/marks-1-0l.43078/

It's not in great shape right now, between me and Mark, someone has stripped the rear interior, fitted a Fury Autoworx rear brace, fitted two STI bucket seats, all sorts of small modifications to the interior - and in general it's a lot less clean.

Currently it's not got an MOT because it's failing emissions and on an overhaul of the exhaust/fuel system I am stuck on the pre-cat lambda sensor. I wanted to get quality parts for the lil thing, but upon receiving the Bosch replacement (otherwise identical) the thread is clearly too small.
I'm searching for a thread collar, and the thread in the exhaust manifold is definitely m18x1.5, but the adapter on the old lambda sensor is seized / bonded with rust.
I can't find a suitable replacement - I've searched for 'collars' 'adapters' etc..

Does anyone have a lead on the part I'm after? I'll try to upload some pics later, but my daily has just given up so I can't get to my garage :rolleyes:

EDIT:

this is the lambda sensor I purchased, https://www.eurocarparts.com/ecp/c/...1d94ac9cf0c49b56005a5c4264dcc5f018c27a&000210

Same part no. and visually identical, it's even obvious that the old lambda sensor has some sort of threaded adapter on!
 
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