A number of after market 5 arm versions were made by the likes of middleburn, Hershey racing (really lovely. Got one on my rts) and small as well. Middleburn did a 4 arm, and I have a 4 arm 'forge' version too. I have also dabbled with other options including possibly the cheapest way to get a 4 arm, using an stx slider, but I think lx and xt also fit.