2012 Prius v Wagon Front Seat Mounting Bolts -14mm, What Pitch?

We do run the seats all the way back on the tracks, but this wasn’t a leg length issue, rather, a thigh support issue, which the risers appear to have solved.

 

There were no off the shelf solutions. The extended bolts I used are M10-1.25 x 70 MM J.I.S. Small Head Metric Hex Flange Bolts Grade 10.9, which match the OEM diameter, thread and strength spec.

My engineered fix uses 1-1/2” tall by 1” OD by 7/16” ID stainless stand-offs/sleeves as risers with the extended JIS bolts as fasteners, with 1/8” stainless washers over 1-3/8” by 1/8" thick laser cut steel weld tab caps as safety/double-retainers for the seat rails, which when raised, ‘shorten’ somewhat away from the original vertical fastener. The caps ensure both fore-aft and lateral capture of the front of both seat rails.

Loosen but do not remove the rear OEM seat rail bolts when replacing the front OEM seat rail bolts with the extended bolts and risers. Then re-tighten both.

I re-fit the OEM plastic seat rail covers, which while raised off the floor by the new risers, still fit, protect from snags, and visually cover the front of the seat rails. Seat remains fully aft in use, but is still adjustable.