As the folks here have stated harnesses are for race seat.
Mix and match very much at your own risk.

However I understand the urge as harnesses are snuggly (maybe i should tighten them) and race seats are uncomfortable for a long commute.
For regular seats you could do a lot worse than the CG lock device. It allows you to get a somewhat snug lap belt tension whilst maintaining the variable belt helpful stuff.
Its not a harness but its far more snug than a normal belt.

I was going to say the same thing. seat belt lock

https://store.windingroad.com/cg-loc...dd-on-p49.aspx

the fact that winding road sells it makes me feel slightly better

Which brands of bucket seats have assorted velcro-in cushions to conform to your back?
I need lots of lumbar support.

Kirkey. The nice thing about the aluminum seats is it is very easy to lift the cover and place a lumbar cushion wherever you desire. They don't move around. You may also add additional cushioning to the seat bottom in the same fashion.

These seats are far more comfortable than you might imagine just looking at them.

https://www.summitracing.com/parts/kir-5517011

https://www.summitracing.com/itemgro...drag-race&ar=1

These are not full containment road racing seats but they will serve you well for a dual duty car. They are not as cumbersome or difficult to get in and out of as a full road race seat but still offer far better than stock containment and structure.

Kirkey intermediates are probably the most comfortable alum. seat on the market. Tons of support.

Wow those are shockingly inexpensive.

The reason I'm so interested in reclineable seats is that my low back really likes to complain on long drives (spondilolysthesis). Changing the angle every so often helps.
It's not as bad now as before, thanks to regular, strict-form deadlifts and squats, but still :-p

So I guess, reclineable seats weak in rear enders?

be aware with the aluminum seats you should really have a roll bar at minimum, solid seat mounts, and a back brace...

(edit - I'm a moron and didn't realize there was a second page of comments.)

Honestly, could be laceration too from pivoting metal bits coming apart and going inside your organs. Dunno.

How many people drive your car? A well positioned race seat is very comfortable.

Sliders with a bucket seat and 6-point harness and HANS is less safe than factory everything??

HANS with a seat on sliders. Lolol. My brain

Jason,

Andrew's post is the only correct answer. You asked, you got a clear answer that unfortunately conflicts with your budget or motivation level. Your problem, not ours.
Do yourself a favor and don't try to rationalize or reason a solution outside of that.

All OEM. Simpson Hybrid-S HNRS optional (3 pt compatible)

OR

full race car, I.E: 4 pt 1.75" DOM mounted at shock mount plate and bulkhead corner, 5 or 6 pt FIA harness (properly anchored), HNRS, fixed position FIA seat, no airbag, fire extinguisher, Snell 2015 full face helmet with visor down /and or eye protection, driving suit, shoes, gloves

The folks that have died in HPDE over the last 15 years have all, without exception, mixed OEM and partial and/or improperly installed race car driver safety equipment.