R5 v. RD triple trees. They’re not the same correct ?

[nickysteps]

Hi all , trying to fit a drum front end on a new build, As far as I know the RD bottom tree is slightly wider than R5 (DS7). I'm pretty sure I have a top triple tree that is R5. Am I missing drum parts here ? Or my forks are bent ?, just a question to those who may have done this. I know the bottom tree is RD, but it lines up with the aforementioned R5 top tree.

[202wagon]

R5, DS7, '73-'74 RD250 drum front end triple clamps are 10mm skinnier than RD350 disc triples.
No mix n match, both top and bottom needed to convert.

[nickysteps]

yep thought so, thanks for the reply cheers !

[Yamaha 179]

Also the fork tubes are different.  The DS7/R5 tubes are tapered at the top and are held in place by the cap; there is no bolt going through the side of the clamp pinching the tube.  Another difference is the steering damper; the RD has a small, hydraulic damper bolted to the damper of the bottom clamp and the DS7/R5 has a friction damper that is adjusted by a long rod/screw turned by a knob located on the top clamp. 
Lyn Garland

[nickysteps]

Thanks Lyn, turned out the issue I've been sweating over was due to original forks being bent and twisted,  HVC cycle sell new ones, so I'll be getting a pair from them soon.