I went to change my front pads today and found the pads I have are about 3mm short. When I looked them up, they only fit up to 2007 models- mine is 2008.
I was about to put them on here at give-away prices when I looked a bit further and noticed on the Link International site that the Ferodo FDB2098ST will fit the rear of the 2008+ ST1300s. According to their site, 2002-2007 ST13s have the same pads front and back.
However the Metal Gear site lists a different number for the front pads, but agrees the rear pads are the same for all ST1300s. They do agree the front pad size changed in 2008.
A bit of trivial to go on with!
A tip I wish I'd seen/thought of earlier: remove the caliper and insert a wide blade screwdriver between the old pads and twist to force the pots back in their cylinders. It doesn't matter that you might burr the pads- they're going in the bin. Purists might like to get their toothbrush onto the circumference of the pots before driving them home (but there's no way of properly accessing the top of the pots to scrub them). That will require removing the pads and putting them back in for the screwdriver trick.