No help from the vendor, I'm afraid;
My message;
The only reason he thinks it wasn't made for the XBR is there is no room for the original oil tank which has had to be replaced with a custom arrangement. If you could ask the previous owner, I'd be extremely grateful. Thanks, Matt.
His reply;
The previous owner is dead!
the only reason there is no room for an oil tank is because a non standard k&n airfilter was fitted.