Cam key for Kent Cam?

Alright lads, I've recently just got my 1.8 8V back from a rebuild and some performance parts, I got a Kent GS2H Cam fitted and it seems that they have no fixed Woodruff key on the timing end and instead looks like it needs one to be fitted when adding the camshaft sprocket. I've looked online for this key and can't find anything in relation to the Kent cams, anyone know of where to acquire one? Any help would be appreciated

I think it is the same size key as the standard cam but I could be wrong, I can't remember if mine had one or not. If you can measure the slot there are some listed on ebay in both metric and imperial sizes.

These are the metric ones-
https://www.ebay.co.uk/itm/Metric-Woodruff-Keys-Key-1-5mm-2mm-2-5mm-3mm-4mm-5mm-Pack-of-1-2-or-5-HPC-Gears/111712997458?hash=item1a029d1052:m:m7zJJGnueWrBgHigsAPwOpA