Increase Character limit on MODEL field confirmation email

What file(s) have to be changed in order to INCREASE the Character Limit displayed/shown on the customer's order confirmation email - right now it looks like it is truncated around 20 characters (not counting spaces). NEED to increase for more info to be displayed. I'm specifically looking at MODEL field / Column, but may need to change others as well.

Any help / insight would be appreciated. Thanks

OC Version 1.5.1.3

FX Designer

I dont believe the model field is truncated. The option value field is

see-> catalog/controller/checkout/order.php

Nightmare, this had me on a wild goose chase for hours!! If anyone else gets this problem, it's actually in the mysql database. For some reason, even though the product model field is set to 64 characters, when an order is created/placed, the model field of the order_product is set to a character limit of 24 (including spaces) so the whole model won't appear in e-mails or a customers order history. Something that perhaps should be corrected in the next release as the template for the e-mail and order history is absolutely fine for a character limit of 64.
To ammend, head into PHPMyAdmin and find the table for "_order_product" where you'll find the collumn for model. change the character limit to 64 or whatever you need. Would not recommend setting it too high though otherwise you'll have to go messing with the templates too.