Parts to change with a transmission replacement?

[08yarisboi]

So
2008 Toyota Yaris liftback, 5 speed manual transmission, 222K miles. Shop quoted about $5000 for parts and labour. I've found a used one on ebay with 69K miles that seems good, and am planning on getting that and a new clutch pack. Installation should be easy- my brother is going to school for automotive technology and his class is currently on transmissions and driveline stuff, so he's able to use the school shop to work on his own car (or any car he brings in).
The shop said that along with the transmission, they would be replacing seals and gaskets, and though I'd check here if any of y'all have done this work.
I'd like to know which parts/part numbers the gaskets and seals and other parts I should pribably replace along with the transmission would be so I can have all the parts on-hand before starting the replacement.