FYI, seatguru is messed up for the DL 763ER; there is no Version 2 of the 763ER (i.e., 30 BE seats and Y beginning at row 15).

The international DL 763ERs are:

1) Version 1(seatguru) is the most prevalent 763ER (45 of DL's 59 763ERs are in this config); 35 BE seats and 181 Y (starting with row 15) and 2 overwing exits.

2) Version 3 (seatguru) is the one that is often referred to as the ex-Gulf Air planes (DL only has 7 of these); these have 30 BE seats and Y starts at row 13.

There is another version that is not listed in seatguru (though it is just a minor variant of Seatguru Version 1) and that is the 763ER that is equipped for longer routes and has the pilot lie-flat rest facility in the place of seats 1C and 1E in the BE cabin. Thus this config has 34 BE seats (minus seats 1C and 1E) but the same number of Y seats (181 Y seats starting with row 15). DL has 7 of this type in their fleet. These planes are used for JFK-AMM, JFK-CAI, JFK-TLV, and ATL-LOS.

Summary:
1) 45 763ERs in the seatguru Version 1 config
2) 7 763ERs in the seatguru Version 3 config
3) 7 763ERs in the 34BE+181Y config (currently not in seatguru).

Seatguru Version 2 is an error.