Sorry, I have recently purchased COX5012, it had a 428fe coupled to a rug 4 speed top loader. The engine had some issues, the gearbox would jump out of 3rd gear when lifting off the throttle. I bit the bullet and purchased a 427fe side oiler and it came with another Ford Rug 4 speed top loader. What I didn't realise was that the original slip yoke had 28 splines where the replacement gearbox output shaft has got 31 splines. I have looked around on the Internet and found plenty of options from the USA. However, I am hoping to drive to the revival meeting and would prefer to find a quicker option from the UK.