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Found several at Mouser that I don't know which to order
The specs look the same and Mouser couldn't tell me the difference
CM7152
CM7153AS15 The first one is 30% cheaper..

Thoughts?

The AS15 suffix is not necessary. This suffix means the lamps have been burned in and tested for current for series circuits. Use the one that is physically the same as the original. Replace the three then keep the good ones for spares.

Mark