This is an Original Fine  thread Left splined hub extension for wire wheels, (Believed) BTC111. with attached rotor.It fits Austin Healey BN2, BN4, BN6,  some late BN1. Rotor is included that has some wearThis part is typical of the thousands of rare original British parts 1949-1994 in my amazing Sebring, Florida warehouse. I have over seven hundred parts in my eBay store, Old English Motor Company..It is divided into 20 categories, including Austin Healey  Parts. If you do not see what you need, please ASK; I will put photos on the store for you.I owned a restoration shop or acquired parts 40 years, and built up a massive inventory, which I have moved to SEBRING, where Healey History was made.. I give free restoration advice.   1954 JAGUARS  or  1954JAGPART   . SHIPPING is by Fedex in the US; please give me your phone number for the package . Out of the US? Shipping is Fedex, but is an ESTIMATE. Please give me address for exact shipping cost.. Thank you. James Dean, thejaguru. now located in Sebring, the Heart of Old Florida.