DF 250 RTB parts and motor upgrade info and parts sorces

If there is already a thread on this subject for the DF 250 bobber that is not 8000 replies long please tell me and I will stop. If not, I thought it would be useful and handy to have a thread that dealt with sometimes hard to find parts such as something as small as a stock replacement turn signal lens that I can absolutely NOT find, 520 chain sprockets (front and rear) and 428 conversion sources, piston and cylinder kits that will add displacement and bolt right on or with minor mods bolt on. Info like this. Thank you for any info in advance that will make owning and repairing / rebuilding a DF 250 RTB or a Heist motor if the exact same? a little if not a lot easier.

Perfect example, I had one hell of a time finding a 520 38t rear sprocket that was an exact fit for my rear wheel. I ended up getting one from a Chinese guy (in China) that had one with the exact size center hole but bolt holes had to be redrilled. 520 16t front sprocket was just as hard to find (have to modify sprocket cover to use) .

OK, If no one wants to post here I'll go over to the 400 reply thread. I can take a hint. BTW, If anybody ever reads this, Does anybody know if the high flow head available from CCW will fit our engine ?