Need to be able to list 10+ model numbers!

[reeldr]

I'm trying to list a product with serveral model numbers. I want the part to come up when being searched with any one of those model numbers.

 

The problem is, when I enter a new product through the interface, it will only store up to 12 characters in the Product Model box. How can I change it to store more model numbers?

 

Thanks for your help in advance ;)