you could use a 5 inch(or longer) bolt, a nut, and 2 washers that are larger than the diameter of the bushing.
put the bolt through one washer
then through the bushing,
then put the bushing on top of the hole of the trailing arm.
take the other washer and put it on the other side of the hole and screw the nut onto the petruding bolt
keep tightening it untill the bushing goes through,
remember to use a LOT of lube for this and it takes patience too.