If you need it, I've got a spare 900 spindle but, it still may not be long enough to get the clips on if the swingarm is like my old one? though it should at least be long enough for full contact.
With the shock reservoir, I never had any contact with it but it was always in the way if topping up oil and for servicing - need to remove to get at the belts and it was prone to getting damaged if the bike fell over but, mainly I thought it looked naff - along the lines of a red bull tin catch tank
The OEM mounting bracket is a simple affair, just uses 2 large jubilee clips to hold the reservoir and, whilst I didn't have one to copy, mine is basically the same thing but in stainless steel, though I used rubber lined 'P' clips rather than jubilee to avoid scratching the casing.