Form 5300 not on pay.gov ??

Got an answer to the question below from my partner who does more submissions than I these days. Apparently you type in "determination" instead of Form 5300 on pay.gov. in order to get the 5300 form.

Unbelievable. Every other form, including 5307, you are asked to fill in the number of the form or the Agency. Type in 5300 and you get a blank. Type in the IRS and you get other forms,  like the 5307, but not the 5300. 

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I am going to submit an individually designed 403(b) plan under the new procedure that allows for this. The IRS website says to use pay.gov.

To my surprise, pay.gov only has a 5307 available. 

It seems that the 5300 has not been loaded into pay.gov. but that is a form for qualified plans, too. 

Any ideas?