Hey everyone, Long lurker first time poster. I have 2 Omega and I am thinking of changing my Speedmaster Moonwatch Professional Chronograph 42mm strap from steel to black leather. When I look at the website (mine is 3126.96.36.199.01.005), I see that there is an official black leather strap 3188.8.131.52.01.001. My question is where can I buy that leather strap and how much does it usually go for? It looks like it is from from alligator so I am guessing about few hundred dollars. My second question is, when buying a band, do I need to know the specific width and length in mm? Is there a name or model or item number for the official moon watch black leather strap? Also do I need an official strap from Omega or as long as the specs match? My last question is, if I bought the strap online or somewhere , can I change the strap myself without voiding any warranty or something (well actually I do not know how to do it but I know someone who does watch repair)? Thanks!