You "May" need to do a Firmware update for the change of the controlhead type for the subject radio.
I checked the Flex in both of my Mid-Power XTL2500 and my XTL5000 radios. They do use the same Flex cable, part number 84009527002, for both the Mid-Power radios, but one of my Mid-Power XTL5000 radios, uses a Flex that is totally different in appearance, with a different part number, 8464459H03. I believe that may have something to do with the radio with the different Flex part number has the Secure Feature and as noted on the 84009527002 Flex Cable, "Not to be used Secure Interface Boards".
And, as for the TIB cable, you will need the XTS5000 High Power Flex cable. The part number is: 84009526001 and the part is still available from Motorola for about $60.00 not including shipping and tax.
This is the Flex you need: