About those Fuel filters and pumps.....

I found 4 original fuel filters thru my local vendor, (2 for now, 2 for later, $6 each), and when I asked about fuel pumps, his reply was, "found an original in Calif. for $380, you want it ? ".
After I picked the phone up off the floor, I searched the chat logs and found several that mention "other" fuel pumps, and also needing some Metric acorn nuts. Are these the pumps sold by Rock Auto or AutohausAZ and others, ( for $100 ), a replacement but with a male banjo fitting attached that will accept the fuel line but I toss the original banjo bolt and use the acorn nut instead?
The car sat in storage for the last several years and I would like to drive it more than park it, at 29 years old I need to change a bunch of parts just because of age & reliability, right ?
I have most of the trunk trim out, I get a pressure buildup even sitting in the garage which may indicate a problem with the fuel tank breather system...(behind the aux a/c unit), both tanks are "bowed out" on top, not flat...hhmmmmm.
So, I will drain fuel, check/clean tanks, fix breather system, replace pumps and filters, and, is there a pn or vendor for the outlet pipe fittings with the screens at the bottom of the central pickup tank ? Might as well change those too....
Thanks, Gary

1985 400i A/T White/Blk Int 11,879 miles

 

Thanks, Steve.....I have over 80 pics of the underside from last time it was on the lift, not a single shot of the pumps, so I will get underneath and take a look ....then I will go shopping.

Gary