These are the guys I used for mine when one lost pressure. They can also shorten (if you have a hardtop), increase and decrease speed and damping and fit stainless ends if you ask/specify
Supplied uprated ones for the Civic when I added some sound proofing to the rear hatch, even reccomended how much they should be uprated after I gave them the weight added.
Not the cheapest place but worth the extra few quid for the excellent advise.