My current bike: https://www.cyclerepublic.com/carrer...tain-bike.html

upgrades:
https://www.ebay.co.uk/itm/31-8mm-Ad...r=502318836337

https://www.ebay.co.uk/itm/Cycling-M...r=532553458640

https://www.ebay.co.uk/itm/Clarks-M3...0/113344769634

https://www.ebay.co.uk/itm/SNAIL-104...r=562938034726

Will they all fit without issue at a bike store?
ALSO, CAN ANYONE LINK ANY DECENT USED AIR FORKS UNDER 150?