There may not be one. I think that car uses a GM transmission with a lifetime fill.
On a 97 528i the speed sensor is located on the transmission tail shaft housing at the top.
It depends on what options the 98 and 97 have. If you get the vin # on both cars and call BMW they can tell you for sure if it will fit.
There is a chain for a 97 528
it is under your seat
Look down low on the transmission for a yellow loop handle on the dipstick.
battery is spent, now to get inside?be creative...
You have to drop the whole transmission pan, then refill from the transmission dipstick
The automatic transmission dipstick is at the rear of the engine , on the passenger side of the engine , next to the firewall
Does it have a dipstick?
You add the fluid down the transmission dipstick tube.
You can find it in between the battery and the exhaust system coming out of the engine.
If auto through the dipstick tube If std. through plug in side of transmission