what prop exactly do i need to get hold of for a blade powered indy
tony

Standard 2wd Sierra AFAIK.
May need shortenning, by MK or other?

You'll need to get one made.
MK do them (by modifying a Sierra unit), I had mine made by a propshaft manufacturer in N. Ireland.
It requires a slider fitted at the front, shortener and rememeber you'll need a sprocket adaptor as well.

Dozy Bee Me!
Didn`t see the BLADE word in your original post and your archive has a pic of a Ford engine, so the revised answer is (as Alistairs)
Standard 2wd Sierra .
WILL need modifying, by MK or other.
MK charge about £60,
MINE IS WITH THEM AT THE MOMENT AWAITING MODIFICATION IF YOU ARE LISTENING
Propshaft adapter also about £50-60

Colin