linking items from item_template to creature_template?

[stinkyjoint]

trying to make a custom mount

i know how to change a mounts model ID and name, so when learnt it displays what i want,

but i dont want to remove that mount from the game,

for example

UPDATE `creature_template` SET `name`='Traveler Carriage' WHERE `entry`=27684; -- item 37719
UPDATE `creature_template` SET modelid1=33315 WHERE `entry`=27684;
UPDATE `creature_template` SET modelid2=33315 WHERE `entry`=27684;
UPDATE `creature_template` SET scale=0.2 WHERE `entry`=27684;

so ofc that code above will change the Swift Zhevra to the Carriage

so how can i go about making a new mount?

i assume i have to link the items from each template some how?