Hello Grumpy, I have a Simplicity 700 Tractor with lots of attachments that I use around the property, tough little unit for a 7hp jobbie, bit tough. I have done a bit of searching a found that the 8/30 gearbox is a Peerless Series 350 pssibly a 353.
Below is the parts list for the 8-30 model ride on.
Regards,
Bruce
Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.