Chainsaw Repair

hello everybody!
im math a stage manager.
first  sorry for my  english, im french...
im new in this forum, im 38 years old and live in France on Atlantic coast. due to the price of wood and also cause i like it, i started this year to cut small trees in forest for firewood for my  house.

i have bought a jonsered 525 to a farmer  for few coins in great condition.
but i have no Ipl... i find on your great forum 535 ipl which looks similar. thats why i register
i have notice some missing parts:
504590302 and 504590301.
is it important ? can i Start to use it ?
where can i find this parts? ive gone to my  husqvarna shop the  guy don't know this model ans can't told me anything.... very  professional!

i hope youll understand.
tanks for your answers.
math

Thank y ou very  much!
Im also looking for a switch on off and i can't find in the shop...

thanks 660magnum!
i send emails to the two shops and notice that you gave their contact. i hope your ok
do you need pictures of my  525?

the  mine looks like the firsts pictures but the poulan 325 seems to have less power... do you have the specs of the 525 cause I don't have anything... is it a good chainsaw? I use a husky 142e in woods but I want to try my old jonsered. can I use 1:50 fuel? or more oil? what is the best to give it a second life?
thanks

I'm sorry but I made a mistake. The Poulan Pro 325 is a little larger at 53cc and is more of a Partner 5000 and has more differences from the Jonsered 525 than I thought?