The 60/40 rear seat assembly requires a quantity of 6 hex head bolts that are 10 x 1.25mm tighten to 47 newton meters or 35 lbf-ft
The left and right hand outside rear seat belt assemblies use a single 7/16-20 UNF hex head bolt tighten to 32 newton meters or 24 lbf-ft
The center seat belt buckle assembly uses two 8 x 1.25mm hex head bolts tighten to 22 newton meters or 16 lbf-ft
Reference; Ridgeline 2006 Service Manual
Pages;20-115, 24-7 & 24-9
The left and right hand outside rear seat belt assemblies use a single 7/16-20 UNF hex head bolt tighten to 32 newton meters or 24 lbf-ft
The center seat belt buckle assembly uses two 8 x 1.25mm hex head bolts tighten to 22 newton meters or 16 lbf-ft
Reference; Ridgeline 2006 Service Manual
Pages;20-115, 24-7 & 24-9