Took out my switch ( older Jacuzzi, model Corsica ) which is a Eaton/Mears Part Number 275-3184-00 Capilary = 14" bulb = 6.5".
Cannot find this part anywhere, however many similar, but all have shorter bulbs.

Question is: does the bulb length matter? or can I use something close.

Can't even find website for Eaton/mears. And Jacuzzi is not much help.

Thanks in advance for any assistance.

Most important issue is the cappilary length, as long as you get one that is long enough then a shorter bulb should make no difference at all.