You can also go to VMware Compatibility Guide: System Search select your product release version in my case it was ESXi 5.0 U1 then over in the section of where it says VID and DID enter that information in. You can get that information from the ESXi shell.
From the shell type
~ # vsish
/> cat /net/pNics/vmnicX/properties - X is the nic that is not showing up
properties {
Driver Name:tg3
Driver Version:3.123b.v50.1
Driver Firmware Version:FFV7.0.0 bc 5719-v1.24
System Device Name:vmnic5
Module Interface Used By The Driver:vmklinux
Device Hardware Cap Supported:: 0x682c030b -> VMNET_CAP_SG VMNET_CAP_IP4_CSUM VMNET_CAP_HIGH_DMA VMNET_CAP_HW_TX_VLAN VMNET_CAP_HW_RX_VLAN VMNET_CAP_SG_SPAN_PAGES VMNET_CAP_IPV6_CSUM VMNET_CAP_TSO256k VMNET_CAP_OFFLOAD_16OFFSET VMNET_CAP_SCHED
Device Hardware Cap Activated:: 0x282c030b -> VMNET_CAP_SG VMNET_CAP_IP4_CSUM VMNET_CAP_HIGH_DMA VMNET_CAP_HW_TX_VLAN VMNET_CAP_HW_RX_VLAN VMNET_CAP_SG_SPAN_PAGES VMNET_CAP_IPV6_CSUM VMNET_CAP_TSO256k VMNET_CAP_OFFLOAD_16OFFSET
Device Software Cap Activated:: 0x14900020 -> VMNET_CAP_TSO VMNET_CAP_TSO6 VMNET_CAP_RDONLY_INETHDRS VMNET_CAP_OFFLOAD_8OFFSET
PCI Bus:66
PCI Slot:0
PCI Fn:1
PCI Vendor:0x14e4
PCI Device ID:0x1657
Interrupt Vector:0x39
Link Up:1
Speed (Mb/s):1000
Full Duplex:1
Uplink Port ID:0x02000003
Flags:: 0x1a0e ->
VLanHwTxAccel:1
VLanHwRxAccel:1
Queue Stopped:8
Pseudo Device:0
Respools sched allowed:1
Respools sched supported:1
Put the vendor and Device ID 14e4 and 1657 into the search and then update and view results. Upload those drivers to your datastore. From your shell type: esxcli software vib install -l /vmfs/volumes/<datastore>/<filename>
That will install your drivers.