Quoted from Mopar:Yes, #63 bulbs were common on many United bowlers.
Like many others, I use #47 bulbs in the head. They're
a little cooler on the glass than the 44s..
Interesting, I called stl ball bowler and they made no mention of using 47’s. But yes the main reason for the swap is what the bulbs are starting to do to the glass.
They also said there is no led equivalent for the lighting above the pins. Doesn’t sound right. They do look like the little night light bulbs or candle bulbs.
I think there are a couple bulbs behind the glass that aren’t 44/47. They are more round and I think behind the frames area.
Thanks for the help, trying to get these for my dad as a gift.