On mine, I used the original 4 speed Speedograph angle drive, and Simon made up an adaptor to mate the two together.

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IIRC, Arwyn also used the original four speed drive and adaptor, and turned it down to fit inside the 5 speed box. He said there was a handy bolt hole nearby the allowed him to use the original clamp The Lotus Elan crew use the same drive and gearbox - that's where I got most of my bits from when the drive broke on my 4 speed.

Speedo Drive

Speedograph Drive - you need their BG2402-03

Drive Adaptor

Clamp

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10