Starter motor with cosworth sump?

What starter motor are people using when using a cosowrth 2wd sump with standard bellhousing?
I've been running a standard escort starter motor with the side ground down to clear the ribs on the allow sump however i'm sure there is a better option?
Anything smaller or is an expensive reduction starter the way to go?
Thanks, Shaun.
I've been running a standard escort starter motor with the side ground down to clear the ribs on the allow sump however i'm sure there is a better option?
Anything smaller or is an expensive reduction starter the way to go?
Thanks, Shaun.