Installing bootloader to sba1

[Doctor Who]

I have a machine on which I want to install Fedora 19.  During the install,
I'm given the option to install a bootloader, but not 'where' other than a
disk (/dev/sda, /dev/sdb).  I use a 3rd party tool to multi boot, so I
would like the boot loader to be installed on /dev/sdb1.

Is this possible to specify during the install?  If so, how?

Thanks.