1984 250R rear shock ?

['84 250R]

I have a bad rear shock on my trike, I was wondering if the shock in the link would work for me. I know I will have to do a little of modifying, but I really want to know if the valving would be set up right for my application. Any info would be great.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=43974&item=4519918559&rd=1

Thanks
Brian Eckstein

['84 250R]

Can anyone tell me what other rear shock would fit?
Brian