oil cooler A4 size,what do you have a rotary. get a big B&M cooler from rocket industries.if you have a big cooler in winter,your oil will take awhile to come up to temp.make sure you pick an oil that will suit for normal driving in winter,otherwise you can get big wear.
hose get from repco etc.
walbro pump, rocket carry them from memory or just get a bosch comp pump which i prefur.
instead of malpassi reg id go an SX or aeromotive. the malpassi's have had a few prob's over the last few years.
plastic bit dont know what you mean.
rubber dust cover you mean?if so bearing place or repco if your lucky,motor bike places might have them.