Looks like you should be able to pull it out and snap the new one in without taking the trans. apart.

9093003098 Genuine Toyota PLUG, BREATHER, NO.1 (ATM) 90930-03098 | eBay
Find many great new & used options and get the best deals for 9093003098 Genuine Toyota PLUG, BREATHER, NO.1 (ATM) 90930-03098 at the best online prices at eBay! Free shipping for many products!
www.ebay.com