Mid range.

https://www.ebay.com/itm/FOCAL-AUDIO-13HP-OEM-5-25-MIDRANGE-4-OHM-MIDBASS-SPEAKER-CAR-HOME-MID-NEW/120605797656?epid=1739042286&hash=item1c14aa6d18:g:KHwAAOSwYGFUtXxS:sc:USPSFirstClass!75189!US!-1

Id prob throw something like these in there if it were my vehicle.Rear fill off deck power should do fine.Just an option to look at. im sure others will chime in with other options

Reinholds Sturiska said:

Hello Im looking for a good mid range speaker for my rear panels. My cutout size is 5inches. I dont think I need coaxial speakers in back. Can I just buy component speaker and only use the woofer and leave the tweeter out? 

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you can run full range thru a basic/decent speaker Dayton Audio is a very reasonably priced driver mfg

https://www.parts-express.com/dayton-audio-dc130a-8-5-1-4-classic-woofer-speaker--295-303

Reinholds Sturiska said:

Alright thanks, but is there any disatvantages of getting component speakers and running just the woofer thru the crossover? Or even without it? Because I would just like to stick to one brand for my build weather it be pioneer or alpine wich is mostly common in my country.

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Only disadvantage is not getting full range without the tweeter as most mid drivers that come with comp sets can play full freq, but arent very good at it. 

oh, and use the high pass filter in your deck, not the passive x-over

Parts express has pre assembled low pass crossovers you could run in line and use your high pass on the hu for the low end and the lp passive for the high end . They have quite a few different options (frequency cut off points) 4 ohm or 8 ohm and they are cheap. You really don't want high frequency on mids won't sound good.