This is Triumph Part #T2023344 – see diagram #9
It is available new online for about $218.62 plus shipping
This one is used and in good condition, recently removed from my 2008 Triumph Bonneville with 48,000 miles on it. I am replacing and upgrading my front brake system.
Mounting bolts and caps (Parts 11, 12 in diagram) not included.
Asking $75 plus shipping plus PayPal fee.