1969 camaro evaporator box and inner box to firewall hardware question

[chevroletaddict]

Hello Camaro enthusiasts When I bought my 69 Camaro thw AC evaporator and the hardware were in a box. I know that the inner box is held on by 3 studs molded into the box and quarter 20 Bolt. I know to sheet metal screws 5/16 I believe hold the evaporator case to the inner box and two sheet metal screws hold the evaporator box where the blower motor is mounted. I cannot for the life of me figure out where this sheet metal threaded Rod combo goes. Does anybody know and could possibly provide a picture. Thank you