I ended up making a steel bushing 0.880" OD x 0.630" ID that press-fitted into the 0.875" spring eye, and machining tapered ends on a 5/8" pin that matched the tapered holes in the shackle plates. I drilled from one end through to the centre of the pin and cross-drilled for grease injection, with the drilled hole tapped for a 1/4"-28 grease nipple.
Malcolm
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