The side cover from a YZ125 will replace the complete right hand side case. This fixes all problems, except that the dipstick no longer can be used as it will foul the clutch.
The attached picture is of the parts I bought from my local Yamaha dealer 30 years ago to remove the Oil pump. The plate is 44mm long with a central round area of 25mm diameter. The 5.5mm holes are at 33mm centers. The black thing is a rubber bung to replace the slot where the hoses use to pass. The hole in the carby I filled with Araldite.
The TY175 workshop manual can be downloaded from my website here.