I got mine from TNT Landing Gear Products.

http://www.tntlandinggear.com/store/..._List_Gear.htm

The part you'll want is their LG-177, $20 bucks. They don't come with any mounting holes in them - just use your old gear as a drilling template. When drilling into the gear use a sharp drillbit and put a drop of oil onto the spot you're drilling. No sweat.

Here's a shot of my SE's nose, showing my YS .53 installation, the new gear from TNT and the Big (13") Prop. Note the scratch on the YS valve cover... I did a low-speed inverted pass, and touched the rudder. Unfortunately the nose touched right afterward. Oops! Broke the motor mount and knocked the tail loose. Fixed it that night and flew it the following weekend.