What other year/models share the SAME FRONT FENDER & STAYS as a 1969 CT175 ?  

Pretty sure they’re the same for most models from 125 & up. Hard to find for sure. Still missing a right side for mine. Cross reference on partzilla to be certain. 

I have used Partzilla and I have gotten conflicting answers

According to CMSNL:-

1968 - DT1
1969 - AT1M, CT1, DT1B, DT1S
1970 - AT1MB, CT1B, DT1C, DT1S, RT1.
1971 - DT1E, RT1B.
1972 - CT2, DT2, RT2.

15 models in total.

The 1971 CT1C is missing from this list as, for some reason, it is showing as having the smaller mudguard fitted (this ties in with my own bike and some promo docs that I've seen).

The size difference between the two mudguards is not great. However, I don't know what scope there is, if any, for mixing and matching the mudguards with the different front and rear brackets.

Here's what Partzilla has: Yamaha Motorcycle 1970 RT1 FRONT FENDER - REAR FENDER (RT1, RT1B) Yamaha Motorcycle 1971 RT1B FRONT FENDER - REAR FENDER (RT1, RT1B) Yamaha Motorcycle 1973 AT3 Front Fender-Rear Fender Yamaha Motorcycle 1973 CT3 Front Fender-Rear Fender Yamaha Motorcycle 1972 RT2 Front Fender-Rear Fender Yamaha Motorcycle 1971 DT1E Front Fender-Rear Fender Yamaha Motorcycle 1973 DT3 Front Fender-Rear Fender Yamaha Motorcycle 1972 CT2 Front Fender-Rear Fender Yamaha Motorcycle 1972 DT2 Front Fender-Rear Fender Yamaha Motorcycle 1971 DT1MX Front Fender-Rear Fender Yamaha Motorcycle 1972 AT2 Front Fender-Rear Fender Yamaha Motorcycle 1973 RT3 Front Fender-Rear Fender Yamaha Motorcycle 1969 DT1B FRONT FORK Yamaha Motorcycle 1970 DT1CMX FRONT FORK Yamaha Motorcycle 1970 DT1C FRONT FORK Yamaha Motorcycle 1969 DT1S FRONT FORK Yamaha Motorcycle 1968 DT1 FRONT FORK Yamaha Motorcycle 1969 CT1 Front Fork Front Fender Yamaha Motorcycle 1970 CT1B Front Fork Front Fender Yamaha Motorcycle 1970 AT1B Front Fork Front Fender Yamaha Motorcycle 1970 ATM1B Front Fork Front Fender Yamaha Motorcycle 1969 AT1E Front Fork Front Fender Yamaha Motorcycle 1969 AT1M Front Fork Front Fender

**** I noticed Partzilla included a 1969 AT1E where you do not  ???? That's what I'm running into

Yes, CMSNL shows all but the competition versions of the AT bikes as using the smaller mudguard.

If you can find a period original parts manual (eg in the Tech Library on this forum), then you can cross reference what is shown in the online, digitalised manuals.

Think also the early front fender is aluminum with riveted on mounting tabs.
Regards,
Joe

I struggled getting a front fender assembly for my CT1B too. I ended up putting a better than nothing solution in place . LT 1 mudguard fits too but it's not right ,however, it doesn't look out of place .
I have found a CT3 one but it's as rough as a bears ass and needs some inventing with the cross brackets on the underside.
I thought of making my own but the supports that spot weld on would be a pain.
Not that any of this solves your problem Yamahahaha.