Is there any reason this ugly thing …

won’t fit on this? Excluding the aesthetic reasons.
Thanks in advance.

No, just get the correct length bolts.
But why have cotton, when you can have silk?

Cheers, that was easy……..Oh and it costs £11.97 for cotton 🙂

The pic of the bash you’ve posted looks like a bash off an SLX double and bash crank.

You might find it wont fit on anything else as the spacing on the slx double and bash is different to the slx tripple.

I tried to fit one to a xt crank and it wouldn’t work.
I got it to fit on with a bit of file work but it sits too close to allow the chain to sit on the top ring.

It’s listed on ukbikestore as Shimano FCM800 Saint Bash Guard. Is that the same as the SLX one?

ukbikestore link

No idea.
I just know the SLX won’t work.