Insure your using the current mod as it is "@pook_mv22mg" not "@pook" any more. The correct class names you'll need are posted on the first page, depending on which of the mv22 you want, you'll place that class name in the DB..
Example:
MV-22 w/ IDWS system:
pook_MV22 (USMC)
pook_MV22_US
pook_MV22_BAF
MV-22 w/ M134 guns:
pook_MV22_DG (USMC)
pook_MV22_DG_US
pook_MV22_DG_BAF
MV-22 w/ M240 guns:
pook_MV22_DG_M240 (USMC)
pook_MV22_DG_US_M240
pook_MV22_DG_BAF_M240
You'll place the vehicle you want to place the class name as a new record in the "traders_data" table.
Example to modify for your needs:
INSERT INTO `Traders_DATA` VALUES(null, '["class name here",2]', quantity, [quantity,"class of money",type]', '[quantity,"class of money",type]', 0, trader menu id, 'afile');