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virtualbox-4.3.4.sfs for Puppy 4.3.1 and most of Puppies 5.x including Lucid, Precise Puppy, Slacko-5.6 and more.
http://shino.pos.to/party/bridge.cgi?puppy/opt/
It has pre-build kernel modules for Puppy-4.3.1, Wary-511, Lucid, Precise-5.5/5.6.1/5.7.1, and Slacko-5.6.
As for the Puppy-4.3.1, need to install SDL.
ftp://distro.ibiblio.org/puppylinux/pet_packages-4/SDL-1.2.13-i386.pet
For other kernels, you need devx and kernel source packages to build the kernel modules.
Type 'virtualbox' on a terminal after loaded the virtualbox-xxx.sfs.
Note that this SFS does not support 64bit Puppies.
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Downloads for Puppy Linux http://shino.pos.to/linux/downloads.html"
http://www.murga-linux.com/puppy/viewtopic.php?t=63332&start=165&sid=15cc06caad0332cad7071b9973984adb