I've mentioned this on a couple of posts already but here's a visual. If any of you guys out there with C/S props are sweating the "spinner issue" here's your alternative.
Thorp Spinner on left, Twin Comanche on right.
The Thorp spinner is 12.75 in dia, the PA-30 spinner is 12.85 so you are dealing with a tiny size difference. Also the PA-30 sits about 1/8" farther forward, which for me is no big deal as my cowl/spinner clearance was minimal.
The first time I saw this on a Thorp was Ken Knowles second airplane (now owned by Doug Shinn). Personally I think it complements the airplane as well as the original spinner and the good news ... there's plenty of them out there.