They all look to be the same 180 and 185
<TABLE style="BORDER-BOTTOM: 2px groove; BORDER-LEFT: 2px groove; BACKGROUND-COLOR: white; BORDER-TOP: 2px groove; BORDER-RIGHT: 2px groove" class=main><TBODY><TR><TH>2008 CHEVROLET SILVERADO 2500 HD LT 6.6L 400cid V8 DIESEL FI Turbo (6) [LMM] : Cooling System : Thermostat</TH><TH>Price</TH><TH>Core</TH><TH>Total</TH><TH>
</TH></TR><TR id=table535part0 class=part0><TD><TABLE class=parts><TBODY><TR><TD class=left><TABLE class=layout><TBODY><TR><TD>GATES Part # 33946
{OE Type - 185º Bottom By-Pass (2 13/64" x 1" x 1 13/32" x 1 11/64") w/1 Seal}
185 Degree; OE Temperature; Seal included Front
</TD></TR><TR><TD>- Stocked in outlying warehouse--shipping delayed up to 1 business day</TD></TR></TBODY></TABLE></TD><TD style="HEIGHT: 40px" class=right>
</TD></TR></TBODY></TABLE></TD><TD id=node535part0price class=center>$18.19</TD><TD id=node535part0core class=center>$0.00</TD><TD id=node535part0total class=center>$18.19</TD><TD class=center>
</TD></TR><TR id=table535part1 class=part1><TD><TABLE class=parts><TBODY><TR><TD class=left><TABLE class=layout><TBODY><TR><TD>STANT Part # 14728 {Regular Thermostat - 185 Degree Bottom By-Pass (2 13/64" x 1" x 1 13/32" x 1 11/64") w/1 Seal}
185 Degree; OE Temperature; Seal included Front
</TD></TR></TBODY></TABLE></TD><TD class=right></TD></TR></TBODY></TABLE></TD><TD id=node535part1price class=center>$20.79</TD><TD id=node535part1core class=center>$0.00</TD><TD id=node535part1total class=center>$20.79</TD><TD class=center>
</TD></TR><TR id=table535part2 class=part0><TD><TABLE class=parts><TBODY><TR><TD class=left><TABLE class=layout><TBODY><TR><TD>STANT Part # 14738 {Regular Thermostat - 180 Degree Offset (2 13/64" x 19/32" x 1 5/32") w/2 Check Valves, 1 Seal}
180 Degree; OE Temperature; Seal included Rear
</TD></TR></TBODY></TABLE></TD><TD class=right></TD></TR></TBODY></TABLE></TD><TD id=node535part2price class=center>$20.99</TD><TD id=node535part2core class=center>$0.00</TD><TD id=node535part2total class=center>$20.99</TD><TD class=center>
</TD></TR><TR id=table535part3 class=part1><TD><TABLE class=parts><TBODY><TR><TD class=left><TABLE class=layout><TBODY><TR><TD>GATES Part # 33947
{OE Type - 180º Offset (2 13/64" x 19/32" x 1 5/32") w/2 Check Valves, 1 Seal}
180 Degree; OE Temperature; Seal included Rear
</TD></TR><TR><TD>- Stocked in outlying warehouse--shipping delayed up to 1 business day</TD></TR></TBODY></TABLE></TD><TD style="HEIGHT: 40px" class=right>
</TD></TR></TBODY></TABLE></TD><TD id=node535part3price class=center>$24.79</TD><TD id=node535part3core class=center>$0.00</TD><TD id=node535part3total class=center>$24.79</TD><TD class=center>
</TD></TR><TR id=table535part4 class=part0><TD><TABLE class=parts><TBODY><TR><TD class=left><TABLE class=layout><TBODY><TR><TD>ACDELCO Part # 131131
{#97241130}
THERMOSTAT,ENG COOL(W/GSKT) 180 DEG
</TD></TR></TBODY></TABLE></TD><TD style="HEIGHT: 40px" class=right>
</TD></TR></TBODY></TABLE></TD><TD id=node535part4price class=center>$28.79</TD><TD id=node535part4core class=center>$0.00</TD><TD id=node535part4total class=center>$28.79</TD><TD class=center>
</TD></TR><TR id=table535part5 class=part1><TD><TABLE class=parts><TBODY><TR><TD class=left><TABLE class=layout><TBODY><TR><TD>ACDELCO Part # 131163
{#97241129}
THERMOSTAT,ENG COOL(W/GSKT) 185 DEG
</TD></TR></TBODY></TABLE></TD><TD style="HEIGHT: 40px" class=right>
</TD></TR></TBODY></TABLE></TD><TD id=node535part5price class=center>$28.89</TD><TD id=node535part5core class=center>$0.00</TD><TD id=node535part5total class=center>$28.89</TD><TD class=center>
</TD></TR></TBODY></TABLE>