On the 54 the blank out plate sits outside of the dash ,or overlaps the opening .The plate also covers the holes were the knobs go on either side of the opening but I think the knobs would only need plugs to fill the round holes.i think your basic unit will fit in the hole but will need a means of fastening it to the dash.if you need any measurements or pictures let me know will be happy to help.

Last edited by KEVINSKI; 02/23/2025 4:06 AM. Reason: No show
1954 Canadian GMC 9300
"The Journey"
Follow in the DITY