So, I had to look up the Synchros RR2.0 saddle and find its specs to answer the OP's question. It turns out that it is a moderately narrow, long-ish and very flat saddle. And it weighs in the 225 gram range. So, find any saddle like that, or buy a take-off on eBay for $40. I have ridden dozens of similar saddles. Before Performance folded its retail outlets, they had a Forte saddle that was a striking copy of the RR2.0. And it weighed only 185 grams. There are many in the Fizik line, Sella Italia, Ergon. Heck, the old E3 Form saddle was wonderful, if you can find one. Folks who know hoard them like a Leprechaun's pot-o'-gold.