Your links appear to be corrupted; you might want to edit them to have just the URL there.
Question, though: What do you need the forks to do?
If you need them to be good suspension, then common cheap forks don't do very much.
I'm using a cheap RST 100mm travel elastomer/spring fork on SB Cruiser (and previously on CrazyBike2), and while it works way better than the crappy stuff I've had before it, it's still not very good.
Is mostly ok for the majority of the street bumps and dips and driveway entrance edges, but there's a number of them with sharp edges over an inch that it doesn't really do a whole lot about, other than helping preserve the wheel from damage on the worst stuff.
I just do what I can to avoid anything more than a couple inches cuz that's just a big WHAM and bounce. :/
And that's only at 20MPH or less on paved streets.
I had a used and well-worn Manitou 100mm travel oil/air fork for a while on a different (more normal) bike, and it worked much better...but it leaks and has to have the air side pumped back up on every ride, and every few miles during the ride, or I'd be using it now (oh, and I broke the dropouts off with a stupid experiment).
You can get rebuild kits for some forks, (I probably could for this one), if you find a good used DH fork (oil/air, also called hydraulic/pneumatic).
But you don't have to have a fork that good if you ride on smooth roads all the time and never deal with bumps.