G1176 INPUT TRANSFORMER QUESTION

Hi Guys,
I start my first DIY project,I'm a beginner.
1/ I want to know if it's possible to replace the Lundahl LL1540 with a LL1517
If it's possible,what modifications must I do ?

2/ Is it a problem if I mount a BD517 and a BD136 (replacement BD518) in the same PCB ?

3/ What's the difference between the BD518 & BD136,these componements provides same performance for the 1176 ?

I'm french,excuse me for my poor english.
Thanks, :grin:

To answer your third question, the BD518 and BD136 are not pin compatable, so you'll have to bend two of the legs to the correct points on the PCB.