Why are you replacing them ?
If you post a photo it will get a better response than a part number .
As some one might recognise them and know of a work around or a part that can be modified to fit.
Repairing obsolete mowers is a daily occurance for me and I am always modifing current parts to replace obsolete ones or repairing the part when it can not be replaced
The right hand arm has been bent so much it won't hold its shape anymore. I've straightened it several times but it keeps bending up again and throwing the wheels out of line.