Thermostat housing bolt and stud

[86MCSS86]

Does anybody have the thread size or preferable a part number for the correct bolt and stud for the thermostat housing for an 88 cutlass supreme classic 307 v8. Thanks

 

[88hurstolds]

5/16-18 bolt and special 5/16-18 x 1.5 stud for cruise bracket GM# 22506338, discontinued,
or just use two 5/16-18 bolts and delete the cruise.
I believe they were also used on the WP.
I have some NOS interested.