I found 2 diffrent 74 led types that come in SuperWhite color to match the cluster ones.... I'm not sure which one to pick to make the HVAC job the easiest as possible.
there is the first one on this page:
http://autolumination.com/74.htm
that says: "The Widest, 3x Brightest and Best #74 Leds Ever Made!
Designed especially for gauges, and applications requiring a large uniform field of bright light
Bulbs are 3/4" (20mm) x 3/8 (10mm)" diameter at widest point with T5mm base to fit standard #74 or #37 sockets
"
And the second one on the same page that says:
"#74 bulbs replace the following bulbs:17 18 37 70 73 79 85 86 2721"
Their dimensions are pretty diffrent......which one makes things easier ?