The SRT kit for the P239 is either long gone of really dearly priced these days. In looking at the parts included it looks to me like the SRT Sear (1200457R) and the SRT Safety Lever (Lever-9) are the only parts in the kit, is that correct?

I just installed two P239 SRTs today. I used P226, P229, etc. kits and I ordered what I thought were the appropriate return springs but they ended up being the same as the original. I just used a pair of small snips and took off a little. Worked like a charm.