Bit of a late reply here but if you can fit new seals you can fit new bushes, they just pop out when the stanctions etc are out, had the bushes out of mine when i stripped them but they looked fine so i popped them back in, FWIW like most old skool forks i think the old Bombers will have a bit of fore and aft movement, should'nt be excessive though.
Is there any other bushing other than the 'guide bushing' in Z1s and Z2s? I presume there must be, as the service manual refers to 'main bushings' which should be replaced if fore-aft movement gets to much. It was these - if they're different from the pilot bushings - that I was assuming would be a bike shop replacement job.
Not sure ?, i had two bushes in each leg out of mine dont think there are further down the leg, bushes are just split plastic sleeves, no special drifts or presses necessary.