Clk parking sensor numbers? (Advice please :))

[Mini mouse]

Hi, I have a problem with my factory fitted sensors stopping working although funnily enough in really wet damp weather they seem to work which makes me wonder if shorting. Anyway it has been on star which has identified that two of my front sensors need replacing - B1003 and B1005.

I plan to get an auto electrician to have a look as wonder if it is more a problem with the connections, I just wondered if anyone knows which way the sensors are numbered up, e.g are they numbered left to right so BL003 would be the third sensor from the left?

Any advice much appreciated, many thanks