Vintage Dirt Bike Q & A

So I managed to break off the little knob part that goes into the clutch lifter itself, and require a new clutch arm.

Only problem is I don't know the exact year of the engine due to the fact its not in a bike (on a go kart)
and where the engine number is on the casing has been smashed off at some stage.

I see there's a few different part numbers for levers (they look the same though)
Any idea if they're interchangeable or what the actual differences are?

22810-360-020 http://www.ebay.com.au/itm/Honda-ELSINORE-CR125M-MR175-MT125-Lever-Arm-Clutch-NOS-P-N-22810-360-020-/121084979841?pt=Motorcycles_Parts_Accessories&hash=item1c313a2a81

22810-360-010 http://www.ebay.com/itm/HONDA-CR125-CLUTCH-LEVER-ASSEMBLY-22810-360-010-W18-/310706984710

Thanks!

A couple of my actuators have a bit longer arms than the others, giving a straighter pull on the cable and slightly reduced lever effort. I think there are four different ones:

22810-360-000 earliest CR125M (nut holding arm to shaft; I've never seen one)
22810-360-010 late '74 CR125M (welded arm)
22810-360-020 mid-70's CR125M / MT125 / MR175 (the most common, I think)
22810-400-000 '76-'78 CR125M, MT125R, '77 MR175 (slightly longer arm)

I don't know the difference between the -010 and -020, could just be a different vendor.

Ray

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'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric