Blimey Spitty I don't know. Not at home right now.
I doubt very much if this helps but here is a photo of my BFP for the Hawker Hurricane (BoB), which had a unique altimeter (not found in the Spitfire).
The instrument fitted in the bottom left hole. Photo of the BFP:
Photo of the Hurricane Altimeter (I own a real one):
Altimeter and Directional Gyro (I also own a real one of those too) Notice the size of the DG (most of which is hidden behind the panel). DG fitted the Spit as well as the Hurricane, and your Bezel fits my BFP Perfectly.
Your other "standard size" bezels fit the holes for the ASI and Climb and Descend. Your Artificial Horizon, and Directional Gyro bezels all fitted too.
Couple of your bezels in situ - I had ordered a few more, but they were still in transit. My Directional Gyro "adjuster" was a dimmer switch from B&Q (Brit DIY store).
My instrument panel in Cliffs of Dover using Virtual Cockpit to display the BFP gauges. Note how well the bezels (Climb & Descend, Artificial Horizon & Directional Gyro) finish the effect off. The DG reading, fits your view panel perfectly (as do all the other gauges).
I will try and get the dimensions of the Altimeter hole for you.