Yes they can, or at least should be if the correct length . Remove the nuts . Pull up enough to remove crank bearing ( what the u bolts pull down on) and you should be able to raise them up and angle over to the side with the play in the hikes to remove them. I have done many while doing service work. If they are cheap repros that are too long then cut them off I would'nt pull a radiator ! Reverse in the same manner , once new ones are in pull them up enough and off to the side to get the hand crank beating plate back into position. Make sure it's positioned properly before tightening fully .
Easy job....
Larry Shepard