Booster seats are recommended up until they are 4'9"/100 lbs. so you could go with with full seat boosters with back/headrests in the meantime. I have seen aftermarket headrests, probably in JC Whitney. Maybe even pick up a 04+ rear seat w/headrests at a yard and retrofit it. Luxury conversion and upfit companies often have stock seats available for sale.
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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)
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