Not only has the foam in the seat compressed to the point that it's no longer as comfortable, but the leather cover on the drivers seat has significantly worn out on the section closest to the dash and the drivers door.

At first, I wondered if it was possible to swap the seat covers between driver & pass. Then thought about swapping the seat foam as well. Then I wondered if it would be simplier to just swap the whole seat as they come out rather easily.

Three things I noticed that might be problems. First, the chair air bags would now be on the wrong sides. Perhaps the capability exists to remount them on the opposite side? Does Volvo make a driver & pass seat or just one seat than can be configured as either? Second, the electric controls for the seat would also be on the wrong side. Possibly these could be swapped as well? Third, the lumbar adjustment would be on the opposite side. This one might not be a problem as long as the knob didn't hit the seat belt spool mounted on the B-pillar.

Anyone done this before? Anyone replaced their seat leather? Anyone replaced the seat cushion?

Please advise.
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1998 V70 T5 110Kmi; Previous car: 1985 SAAB 900T, 254kmi

This isn't going to work...you'll just be frustrated over every step of trying to make this work, not to mention the safety issue of the airbag if you do succeed. Find someone parting out a '98 V70 and buy another seat...much easier. 850 seat won't work and from '99 the airbag module changed from what I understand, so you'll have to buy one from a '98....good luck.
Try www.volvospeed.com and www.swedespeed.com in the sale sections.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.

Another thought I had was to swap the cushion and leather cover with the back seat behind the driver . . . they look about the same size.

I need to investigate how the leather seat bottom is attached to the frame and what type of padding is used and how it's attached.

The passenger & back seats are notably more comfortable & supportive than the drivers since they're so rarely used.
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1998 V70 T5 124Kmi; Previous car: 1985 SAAB 900T, 254kmi