Private network labels can be distributed in either of the following ways:

One label per VPN instance
One label per VPN route
When a large number of VPN routes exist on a network, many private network labels are required if one VPN route is allocated with one label. These private network labels may use up all entries, In this case, each VPN instance can be allocated a private network label to reduce the chip entries used.

Thunder-link.com have GPBD, GPFD and GPBH