Need help getting correct cockspurs

OM2

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I need to replace 2 cockspurs.
See pic below:

xPa4Pcd.jpg

Ideally, I want to buy the same and just screw into the existing holes - but this part, I'm just not sure about.

I bought a pair from Toolstation - they're the wrong depth - they don't come with any measurements at all so I didn't know beforehand.

I've found this one on Amazon:
RUTpsu7.jpg

The bottom plate measure is given as 73mm - which is the same as what I have. The other measurements are not clear, see below:
FjDgZss.jpg

The 'height' of my cockspur is 17mm or 17.5mm - I looked up where to take measurements.
I've found this one on ebay:
4IcnHwJ.jpg

That looks very similar to the existing. But no mention of the height!
I also found this on Amazon:
EQYhAqd.jpg

PROBLEM: no measurements given at all!

Or... should I just go for a generic one like this:
cxlQUWE.jpg

This one covers all heights (with spacers). But I'm not sure of the holes on the bottom plate - I guess I might have to drill new ones.

Thanks.
 
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OM2

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@RandomGrinch I think it does matter.
The ones I got from toolstation won't fit - out by 10mm at least.
I guess I'll just go for pot luck and buy ones that 'look' similar ‍‍
 
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the height ( stack ) does matter if you aren't buying new wedges, and if you puick any height , you then have to work out the wedge height. 17mm Stack height is fairly common , Try the Bay of E's , there is usually a lot of sellers such as Jcplastics, Gardinia, Northwesthardware to anme a few that will be more than willing to help
 
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OM2

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Thanks for the replies guys.
I ended up order 17mm from Amazon.
Fairly cheap at just over £5 each.

I think we need wedges in all windows anyway...
So I'll be buying some for replacing around the house.
QUESTION: are the wedges glued on or can I just prise them off?
Thanks.
 
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some are glued on , some have little pegs which fit in pre drilled holes
 

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