Grp 26 is about same height and depth as a 22, but shorter lengthwise, a 26 is almost square. I forget the app for a 26, been a while since working at Sears in the winter with the center aisle of the shop lined with cars brought in because the batteries died. I used to know off the top of my head what "group number" battery fit what. NOT what the application guide said, because a small Die Hard cost the same as a physically larger one, and I'd put the biggest battery in that would fit the hole and work with existing hold down hardware. Not all were the same. A physically larger version of the same price line of batteries would always have more cranking amps. so for no more money, you could get more power within the same price class.

I found this thread when trying to find a battery for my 1964 Model 100. My battery box is 8 3/8" wide. I'm a little confused about Merk's battery tray picture, because mine shows an exposed steering column and is only 8 3/8" wide... his doesnt show the column and is over 10" wide...

Going by my size, looks like a Group 26, 57, or 70 car battery would fit.

Anyone used these sizes and what's the cheapest real car battery that's not the "lawn and garden" walmart one.

Just saw this. Interesting. How can I check for a compression release on my K-241 engine?

rotate the engine CCW, looking at the PTO, and observe the exhaust valve, either through the spark plug hole or by removing the valve cover on the side of the engine. Rectangular cover to the left of the carb. If the engine has ACR, you'll see the exhaust valve lift just slightly as the piston approaches TDC.

Could check the pulley on the starter, but I don't know the dimensions off hand, (Merk might) and the engine could have been changed, so it's no guarantee.

Thanks Sawdust!

The tower is not in the tractor.

I don't have the measurement. My 100 is at my Son's place.