JBL 4312 L-Pad puzzle

Hi
I am currently restoring the crossover networks on a pair of JBL 4312's and I am finding it difficult to source the correct l-pads. The l-Pads that are coming out say cosmos 50db 8 ohms. I have checked the internet and read as much info as I could find but none that answer this question. The audio karma site has a very interesting piece on a restore project on a pair of 4311, but this lists 15w 8ohms l-pads as replacements. Is there any relation between 15w and 50db? Would this be the correct choice/done thing? If not, what should I be looking at installing?
Hope that all made sense as I am not a tech by any stretch of the imagination..

cheers dbeed:blink:
P.s. The physical sizing of any potential replacements has to be like for like due to how they mount.. You probably already know that but just being safe.. I am new here!!