Your bezel definitely has had better days.
The '81-up gauge bezel can work, but if I remember right, it just doesn't fit right at the top when using the 73-80 padded dash.
Check with the site administrator, CaptKaos. Also, if there are any salvage yards in your area, look in the 73-80 trucks (i.e., the round headlight models) for the bezel. If you find one, make sure to get the lower part that goes under the column and keep in mind that the a/c bezel is different than the heater only bezel (a/c vent cutouts on the a/c bezels, no vent cutouts and a storage pocket on the heater truck bezel). Lastly, keep an eye on ebay as instrument bezels do show up there from time to time at reasonable prices.