Saving Old Seagulls

Just wondering if anybody knows the diameter of either the 21 tooth, 30 tooth, or 48 tooth bevel gears (large gear in lower unit). Also, are there any differences (ie. physical size) between the two different pinion gear sizes?

Thank you.

I am looking for a model 125 or 170 but have had no luck finding any. It doesn't need to be in working condition, but all parts should be there. I don't mind if the con rod is broken. I am in Bermuda and would need to get it shipped to me - I do have a friend studying in Bristol at the moment so tha...

I've found myself a mint 5R and was wondering what they are worth today. I know they are pretty rare and after some quick research I haven't seen any prices of any online. I am new to the Seagull scene so any help with this would be great! What would you pay for one?

Andrew