are most of the nuts in the car exhausts for the sensor the same size? and can a 'universal' ebay sensor be used?

i have a 88' 323 mazda that NEEDS a new sensor something chronik (for a mate) and im looking for a cheap option for him.

its a one wire setup and im thinking that the uni fit jobs are all the same as stoatch is at 0.45v approx for all cars, if im not mistaken.

thanks guys

I am doing research for my megasquirt instal and from what I have read you should be able to use the Ebay item with out any dramas.I used an aftermarket 4 wire on a customer's car and it worked no worries and the only differences are the plugs that join them to the harness so go for it .Cheers Kevman