Sure on the part # requests, but FIRST & FOREMOST...
**DO NOT WASTE YOUR TIME OR MONEY ON A NEW FR. SPROCKET, IF YOU DON'T HAVE ACCESS TO A POWERFUL IMPACT WRENCH. PERIOD!*
It seriously will not come off otherwise. That said, I actually started by ordering the JT 16T & 17T Part # JT1537-17 & prob JT1537-16 (can't make out last digit now) but they were absolute tanks for weight, solid, super thick and crazy heavy.
So I ended up ordering a couple of Pro-Teks from an ebay seller "gottheparts10".
I'd post a link, but I've previously tried to and it's no longer active & therefore pointless. Check his store on ebay though, possibly you can find them there...
16T = Pro-Tek #131-16 & also picked up the 14T #131-14.
He only had one 14T left at the time & they were half the price & twice the quality of anything else I could find compatible with stock 525 Chain etc.
If you can find the pro-tek's for under $30 (like i did) or honestly, even $40 don't hesitate!! They are top notch quality, made of steel, have 8 weight-saving holes & a flat, smoth / slightly thinner center-profile / thickness than the oem or JT's, but correct size & shape "525" sprocket teeth & a perfect fit overall.
They are between 1/2 - 2/3 the weight of the JT's / oem style sprocket (no rubber shaft collar), but imo the drive quality feel is just as good as oem sprocket. I can't feel any distinct differences. Although, It's hard to compare a difference in feel or smoothness when you're using 2 different size sprockets.
The Pro-Teks have a nice, high quality, brushed or stainless steel style finish, not sure if actually stainless steel, but the 16T I used for several months never rusted or shows any corrosion yet. Whereas the JT's part# has virtually disappeared from a layer of surface rust, just from sitting out in my shop for a year...
The 16T is a pretty good option overall, very convenient in general. It does tame 1st & 2nd gear acceleration a bit, but also reduces unwanted wheel lift considerably. After that it's not really noticeable "performance-wise" until 6th gear or around 130ish, but most of the time, you'll def notice the stretched out / wider feeling of the gears in-between 1st & 6th, (similar to 5 vs. 6-speed manual in a car).
I've been practicing my 2nd gear clutch-ups & power wheelies a lot lately, so I decided to go back to my 15 before I finally try out the 14T & see what I can do in 3rd gear w that extra torque.. Either way, hope this helps.
I'll follow up & share my impressions after I have a chance to compare all 3 over the next month or so.