Need help with gas cap!

[charlie81]

Ok so when i bought my bike my gas tank didnt have a cap I did see the replacement one with key but not really digging it!! my question is what other gas cap can i use on the original tank i was looking in dimecity and found one that i lke becouse its simple but dont know if it will fit the stock tank.
Any help is gratly appreciated

http://www.dimecitycycles.com/vinta...orcycle-fuel-tank-parts-fuel-cap-49-0447.html

 

[grepper]

That wont fit unless you modify the filler hole.

 

[Paulrxs650]

In the past i have used these. I take of the original neck etc thern braze the brass collet on and screw ther new cap on.
http://www.ebay.co.uk/itm/CLASSIC-M...arts_Vehicles_CarParts_SM&hash=item5aec87a240