Does anybody know the correct bolt sizes for the Thermostat housing for 2001 Xj?

I did a search and people are saying different sizes:
-One post said top bolt is 1-3/4" long and the bottom is 3/4"
-Another said "top bolt is 1" long and bottom bolt is 2-1/4"

Also, are these flanged?
From what I understand they both are 5/16 diameter with a 18 pitch,

Thanks guys!
-Fletch

Thanks guys!
-Fletch

Top bolt: 5/16-18 x 1 1/2 inch long.

Bottom bolt: 5/16-18 x 2 1/4 inch long.

Yes, they are flanged head bolts. Don't overtighten them.

Thank you Sir!

On another note:
Does anyone the bolt size for the 2 top bolts for the A/C compressor Bracket that bolts onto the cylinderhead? (pictured below)

top bolts for the A/C compressor bracket that bolts into cylinderhead?

Figured I'd ask while I'm here instead of making a separate thread..

Also, with regards to the Thermostat housing bolts. Where could I find these in brass/bronze?
The 5/16-18 x 2 1/4 inch long bolt seems like it be hard to find especially locally.