Is that a 4" diameter filter? If it is that is the size that was on my compressor and I found a 4" replacement filter for those Cal Custom air cleaners at the parts store.
I went in on my 18x20 and place hurricane straps on all the rafters. Then I placed 2x10's across and bolted to the wall studs and also placed some diagonal 2x4's from the 2x10's to the studs and jacked it up and set it on mobile home axles to roll it off the slab. It really wasn't too bad to...
I installed a chain link fence by driving posts and then driving in anchors that slip around the post and it worked out really well! The tools to install it had a metal plug that went inside the end of the post to prevent smashing the post while using a post driver.
Just installed a Wayne Dalton door with the same type of adjusters and it was really easy to adjust. I find they are a little light on their recomendations for number of turns on the springs though. All you need is a wrench or a ratchet to adjust the springs.
Also keep in mind that Lowes will price match competitors pricing plus take an additional 10% off. You just have to show an add or printed info to verify that the items are identical.