I need some advice on what is the best/cheapest options to fix the PD on my SE?

 

That is a very controversial question. There is a long thread in the second gen archive about the issue. Basically, it comes down to this; you can replace it with a new part from Mazda which is the safest best way to go, but the most expensive. Or, you can replace it with a banjo bolt, which some people claim will eventually ruin your injectors.
I have done it both ways. From now on, I am going to replace them with the factory part, just to be safe. But, that opinion is very argued among rotary heads.
The banjo bolt can be purchased from Summit Racing. If you look up the thread, I think you can find the part numbers.