I've replaced the ATF cooler on Mellow Yellow (1.9L) with an external
ATF cooler from Gowesty. The two coolant hoses that used to run to the
cooler are no longer in use. Though Gowesty has you connecting the two
unused hoses together, this is a silly idea, as it injects hot coolant
into the radiator return hose. So I'll be plugging those two hoses with
5/8'' bolts secured with hose clamps.

Are your generic hardware store worm-drive clamps good enough for this?

--
Rocky J Squirrel