Gaspachi or OK Hatch ?

Getting ready to install the oval front hatch on my Scrambler and was wondering if a Gaspachi hatch cover will fit it any more snuggly than the OK cover ? My guess is they are probably made in the same factory , same dimensions , but I"ve been wrong before .

 The reason I ask is because my son just installed the OK cover and we were both surprised it was not a little tighter , any fixes for that ? Think if they are all that way mayby a strap or two may be in order instead of just the clip at one end .

Here is the link for the OK hatch 6" cam lock:      http://www.austinkayak.com/products/2779/Ocean-Kayak-6in-Cam-Lock-Hatch-Kit.html

It may be a better option than either of the other two (if you are talking 6" hatch) IMHO. 

If you go through ACK and spend 39.00 or more shipping is free.-----good luck   Jeff