Perkins 3 bolt thermostat housing cover

[jkishel]

Transatlantic diesels for anything Perkins, but if it's just a gasket, make one yourself as described above.

[four winds]

X-acto knife is a good tool as well to augment scissors.

[Morgan416ketch]

Working on removing pieces bit by bit removing corrosion and then painting them any tips

[Windwalker44]

I just completed an overhaul of my Perkins 4-154 and received everything I needed from www.parts4engines.com/ in the UK.
Half the cost of any State side distributor and the shipping wasn't bad.