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Okay, the Ye-2 (X-2) was one of several prototypes leading to the MiG-21. The Ye-4 was the first delta-wing prototype, and both flew at a Victory Day parade, resulting in the Ye-2 getting the reporting name 'Faceplate', and the Ye-4 'Fishbed'
'Fishbed'
Really

There are a number of detail differences between the -21 and the Ye-2, though basically it's a -21 with MiG-19 wings, so...

The Trumpeter F7-II is widely available, and, usually, cheap. I've got a stack of them to do various early -21 prototypes. I just need to start making full-length canopies
The Attack MiG-19 has two kits in the box, which is nice
On top is a Gashapon 'Area-88' MiG-21F-13, which is accurate enough, with chunky details, which will be providing the canopy.
If you're unaware of it, 'Area-88' is a manga and anime series about the civil war in an east African desert nation, the two sides of which are rich enough to hire mercenary pilots and buy any jet from around the world to fight and die for them. There's an old set of ten 1/100 kits of some of the stand-out 'planes, some of which were later re-issues by Revell
'Fishbed'
Really

There are a number of detail differences between the -21 and the Ye-2, though basically it's a -21 with MiG-19 wings, so...

The Trumpeter F7-II is widely available, and, usually, cheap. I've got a stack of them to do various early -21 prototypes. I just need to start making full-length canopies
The Attack MiG-19 has two kits in the box, which is nice
On top is a Gashapon 'Area-88' MiG-21F-13, which is accurate enough, with chunky details, which will be providing the canopy.
If you're unaware of it, 'Area-88' is a manga and anime series about the civil war in an east African desert nation, the two sides of which are rich enough to hire mercenary pilots and buy any jet from around the world to fight and die for them. There's an old set of ten 1/100 kits of some of the stand-out 'planes, some of which were later re-issues by Revell